The Riftbound rules

A single instruction is made up of a game action and its complement. 135.2.b.5.a. The complement of a game action is made up of the players or Game Objects that perform that game action, that that game action is performed on, the condition under which it is performed, and the duration for its effect to last. Some game actions omit a complement entirely. Example: Void Seeker is made up of two instructions. The first is “deal 4 to a unit at a battlefield.” Here “deal 4” is the game action, while “a unit at a battlefield,” is its complement. The second instruction, “draw 1,” has no complement. Example: Teemo, Strategist’s defend trigger reads “When I defend, choose an enemy unit here and reveal the top 5 cards of your Main Deck. Deal 1 to that unit for each card with Hidden revealed this way, then recycle the revealed cards.” There are four instructions here: “choose an enemy unit here,” “reveal the top 5 cards of your Main Deck,” “deal 1 to that unit for each card with Hidden revealed this way,” and “recycle the revealed cards.”

Non-Unit Gear cannot normally become located at a Battlefield unless by some special means. Example: Gear are played to Base unless an effect specifies otherwise. A gear played from Facedown, which is specified to be played to the Battlefield it was played from, will enter at that Battlefield. Gear can also become located at a Battlefield if they are attached to a unit who becomes located at a Battlefield. A Gear that is a Unit can move to a Battlefield. See rule 811. Hidden for more information. See rule 716. Attachment for more information.

5. Recall all Unattached non- Unit Gear and non- Unit Runes at Battlefields, and all Permanents and Runes in Bases other than their controller’s. Remove all Hidden cards from all Battlefields that are not controlled by the same player and place them in their owner's Trash.

If any of the spell's targets are no longer legal, those game objects, players, or zones are unaffected by the spell as it resolves. Any instructions related to an illegal target can’t be followed. Example: A player plays Void Seeker, a spell that says "Deal 4 to a unit at a battlefield. Draw 1." The unit's controller uses a Reaction to move the unit to their base. Since the unit is no longer a legal target, it is not dealt any damage. Void Seeker's controller still draws 1. Example: A player plays Bellow’s Breath targeting a unit in combat that reads in part “I can’t be chosen by enemy spells and abilities unless I’m in combat.” In reaction, that unit’s controller plays Flash, moving the unit to their base. The unit is no longer in combat, so it is no longer a legal target for Bellow’s Breath. The unit will be unaffected by Bellow’s Breath as it resolves. Example: A player plays Hidden Blade from the facedown zone at a battlefield, targeting an enemy unit. In reaction to Hidden Blade, their opponent plays Tideturner from facedown at another battlefield, choosing to swap locations with the unit Hidden Blade targeted. When Hidden Blade resolves, the chosen unit is no longer at the appropriate battlefield, so any instructions related to that unit are ignored.

Some instructions may reference Game Objects affected by, or Game Actions performed in, other instructions in a card. The referenced and referencing instructions are called “linked instructions.” Example: Hidden Blade reads “Kill a unit at a battlefield. Its controller draws 2.” The “its” in the second instruction references the unit in the first, so the two instructions of the spell are linked. 359.3.e.14.a. In order for a later linked instruction to execute, its earlier linked instruction must have executed. If the earlier linked instruction is ignored for any reason, the later linked instruction will also be ignored. Example: Hidden Blade reads “Kill a unit at a battlefield. Its controller draws 2.” If the chosen unit changes zones or moves to base in reaction to Hidden Blade, the spell will mistarget and the first instruction will be ignored. If the first instruction is ignored, the second instruction will not execute and the unit’s controller will not draw 2. 359.3.e.14.b. If the Game Action performed in an earlier linked instruction is replaced, this will not affect the later linked instruction, unless the later linked instruction directly references the Game Action being performed. Example: Hidden Blade reads “Kill a unit at a battlefield. Its controller draws 2.” This effect is split into two instructions: killing the unit and the targeted unit’s controller drawing 2. The later linked instruction doesn’t reference an action directly, so it will execute even if the kill action of the earlier linked action is replaced by some other event. Example: Deathgrip reads “Kill a friendly unit. If you do, give +[M] equal to its Might to another friendly unit this turn.” If the friendly unit in question is not killed by Deathgrip because its death is replaced with another event, the later linked instruction will not execute because “if you do” directly references the game action. 359.3.e.14.c. Referencing a game action in this way only refers to the game action being performed and the object or player it was performed on, not the circumstances of its performance. Example: A spell reads “Deal 3 to an enemy unit at a battlefield. If you do, heal units you control at the same location as that unit.” If some but not all of that damage is prevented, the later linked instruction will still execute. Example: A spell reads “Banish an enemy unit at a battlefield, then play it to any battlefield. Then if you do, do this: stun all enemy units there.” A player plays it targeting a unit that has a passive replacement effect that reads “I enter in base.” The replacement effect causes the unit to enter in base, but this does not prevent the reflexive trigger of the spell from being placed on the chain. All that matters is that the unit was played.

Information referenced in an instruction in this way will be checked on execution of the instruction. Examples: A player moves Yasuo, Remorseful to an occupied enemy battlefield and initiates combat there. In reaction to the Yasuo, Remorseful attack trigger, their opponent plays Fight or Flight from hidden targeting Yasuo, moving him back to base. When the attack trigger resolves, “here” is no longer the battlefield where combat is ongoing and the attack trigger mistargets. In reaction to a Yasuo, Remorseful attack trigger, an opponent plays Stupefy targeting Yasuo. When Yasuo’s attack trigger resolves, it will deal damage equal to his current Might of 5. 359.3.f.2.a. When a referent checks information on execution of the instruction related to a target, and that target isn’t legal, that referent will return “null” and all instructions related to it will be ignored.

Some information used by the effect of a triggered ability is referenced from the triggered ability itself, such as “enemy” and “friendly” status. This information is checked on execution of the referencing instruction. Example: Yasuo, Remorseful reads “when I attack, deal damage equal to my Might to an enemy unit here.” Yasuo moves to an occupied enemy battlefield and his attack trigger goes on the chain. In reaction to the attack trigger, the defending player plays a hidden Hostile Takeover and gains control of Yasuo. The triggered ability is unaffected by Yasuo changing controllers, and “enemy” is in reference to the triggered ability itself, so it will resolve with no issue. Example: In reaction to the same Yasuo, Remorseful trigger, say the defending player had instead played a spell that reads “[Reaction]. Gain control of a triggered ability. You may make new choices for it.” They chose the attack trigger. When Yasuo’s attack trigger resolves, if they didn’t make new choices for the trigger, the controller of the triggered ability will no longer be an enemy to the targeted unit, so the triggered ability will mistarget and do nothing. If they instead chose Yasuo with the attack trigger, he would be an enemy unit to the triggered ability and so it would deal damage equal to his Might to himself.

The Hidden keyword allows a player to pay a cost to Hide a card any time they have a Hidden card in their hand or Champion Zone and meet the prerequisites. See rule 811. Hidden for more information.

Cards that are facedown at Battlefields have their gameplay properties and permissions defined by the effect that put them there. Example: Cards that players Hide with the Hidden keyword can be Played for [0] on any subsequent turn as a property of the Hidden keyword.

Remove all Hidden cards from this Battlefield that do not share a controller with the Battlefield .

Any units or hidden cards there do not move and are otherwise unaffected by this process. See rule 438. Replace for more information.

If the removed battlefield was applying any continuous effects, those continuous effects immediately cease, which may cause changes in the characteristics of units or hidden cards there. Example: A battlefield reads "Units here have +1 [M]." If that battlefield's owner concedes and the battlefield is removed from the game as a result, units there immediately cease to get +1 [M].

If no damage was Dealt, then Bonus Damage will not apply. Example: Teemo, Strategist is a unit that reads in part “When I defend, choose an enemy unit here and reveal the top 5 cards of your Main Deck. Deal 1 to that unit for each card with Hidden revealed this way, then recycle the revealed cards.” He has Rabadon’s Deathcrown attached to him. An enemy unit moves to the battlefield where Teemo is located and a combat opens there. Teemo’s controller reveals the top 5 cards of their Main Deck and reveals no cards with Hidden. Although the ability has 3 Bonus Damage from Rabadon’s Deathcrown, no deal action is performed for the Bonus Damage to apply to.

Hidden

Hidden is a keyword that acts as a prerequisite to perform the Hide Discretionary Action.

It is present on Spells, Units, and Gear.

It is functionally short for "While this card is in your hand or in your Champion Zone on your turn during an Open State, you may pay [A] to hide this facedown at a battlefield you control that doesn't already have a facedown card hidden there for as long as you control that battlefield. Beginning on the next turn, this gains [Reaction] and you may play this, ignoring its base cost."

It allows the player to take the Discretionary Action Hide .

Hide is not a subset of Play .

Hiding a card does not open a chain.

Playing a card from facedown (or "from Hidden") does open a chain.

Some choices made while playing a card from Hidden are restricted to the battlefield where it was hidden. A card cannot be played from Hidden if it is a spell with no valid targets under these restrictions. See rule 355.6. Targeting for more information.

A hidden permanent must be played to that battlefield. 811.1.d.1.a. This includes hidden gear, and overrides the normal restriction that gear have in only being allowed to be played to base.

If a hidden spell or a play effect of a hidden permanent chooses any targets, those targets must be chosen from among options at that battlefield, unless the ability explicitly restricts targeting in a way that makes this impossible. Example: Blastcone Fae is a unit with Hidden and “When you play me, give a unit -2 [M] this turn, to a minimum of 1 [M].” Because this is a play effect, its target must be chosen from among units at the same battlefield if Blastcone Fae was played from Hidden. Example: Tideturner is a unit with Hidden and “When you play me, you may choose a unit you control at another location. Move me to its location and it to my original location.” Because its play effect has a targeting restriction that can never be fulfilled by a unit at its battlefield, its target may be chosen freely from among the available options. 811.1.d.2.a. Each target is treated separately and individually when processing this rule. Example: Smoke and Mirrors is a spell that reads in part “Choose a unit you control and another unit you control at a different location.” If Smoke and Mirrors is played from hidden, the first unit chosen can be chosen at the battlefield Smoke and Mirrors was played from, so it must be. The second unit chosen explicitly restricts targeting in a way that makes this impossible, so it can be chosen from any location.

If a hidden spell or a play effect of a hidden permanent causes you to play a unit, you must choose to play that unit at that battlefield.

Abilities and instructions of hidden cards other than the choices listed above function as normal. Example: Stand United is a spell that has Hidden and says “Buff a friendly unit. Buffs give an additional +1 might to friendly units this turn.” If it’s played from Hidden, the first part of its ability must choose a friendly unit at the same battlefield, but the second part of its ability affects all friendly units with buffs, no matter where they are.

Instead of being hidden, a card with Hidden may be played for its cost as normal, at its normal timing with no restrictions on targeting.

Multiple instances of Hidden are redundant.

Hidden, and whether or not a card has Hidden, is a characteristic of the card and may be checked or referenced by other Game Effects.

This is independent of the state of being facedown.

A card that is Hidden gains Reaction while facedown or played from facedown, and may be played any time a card with Reaction may be played as a result.

The property is granted to the card in its facedown state, and is not publicly known.

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