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