cr:5.1.2a

Effects that apply to the next card played are applied if the card matches the effect description. Effects that are dependent on any undetermined parameters of the card are applied when those parameters are declared.

Example: There are three continuous effects active: “The next attack action card you play gains +3{p},” “Action cards cost {r} less to play,” and “Attack action cards you control have +3{p}.” When an attack action card is proposed to be played and is moved to the stack under the player’s control, all three effects begin to apply immediately.

Example: Goliath Gauntlet has the text “The next attack action card with cost 2 or greater you play this turn gets +2{p}.” If you play an attack action card with a cost of X, at the time you declare the value of X to be 2 or more, Goliath Gauntlet’s effect will apply. If you declare X to be 0 or 1, Goliath Gauntlet will not apply.

Example: Become the Cup has the text “As you play this, choose a color. This gets the chosen color.” When Become the Cup is announced, the effect is applied - the player declares a color and the card gets the chosen color.