Last Updated: 2026-10-09

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420. Play

420.1. A player Plays cards by placing them on the chain and queuing them to be finalized. See rule 349. Playing Cards for more information on playing cards. See rule 337. Finalize for more information on finalizing cards.
420.2. This is a Discretionary Action.
420.3. Game effects may result in cards being Played as part of their resolution.
420.4. Some Abilities trigger when cards are played or otherwise check whether cards have been played.
420.5. If an effect refers to a card being played and doesn't do so by means of checking whether cards were played, it refers to the card being added to the chain and queued for Finalization, that is, the Play Game Action. Example: Astral Heron is a unit that reads "When you play your first card each turn, if I'm at a battlefield, the next card you play this turn costs [2][A][A] less." This effect applies a discount to the next card the play game action, discretionary or limited, is performed on.
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