Card text
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Official rulings
2 rulings · in English, source ScryfallA player affected by this card can sacrifice a permanent any time they could cast an instant. This is a special action that doesn’t use the stack and can’t be responded to.
2008-08-01 · Wizards of the CoastA player can only sacrifice a permanent to end this effect if they have more permanents than any other player, and they haven’t already sacrificed a permanent to end the effect this turn. The ability to sacrifice a creature is granted by the same effect that is being ended.
2008-08-01 · Wizards of the CoastAll printings