{T}: Add {B}. Whenever a creature you control dies, put a corpse counter on Crowded Crypt. {4}{B}{B}, {T}, Sacrifice Crowded Crypt: Create a 2/2 black Zombie creature token with decayed for each corpse counter on Crowded Crypt.
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Decayed does not create any attacking requirements. You may choose not to attack with a creature that has decayed.
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Decayed does not grant haste. Creatures with decayed that enter the battlefield during your turn may not attack until your next turn.
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Decayed represents a static ability and a triggered ability. "Decayed" means "This creature can't block" and "When this creature attacks, sacrifice it at end of combat."
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Once a creature with decayed attacks, it will be sacrificed at end of combat, even if it no longer has decayed at that time.