Crowded Crypt

Mana cost: {2}{B}
Type: Artifact
Set: Midnight Hunt Commander #17 (rare)
Price: $0.47 USD

{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.)

Crowded Crypt has 4 printings, first in Midnight Hunt Commander (2021). EDHREC ranks it #2,425 among Commander cards. It appears most in Wilhelt, the Rotcleaver decks (11,253 on EDHREC). 2 public decks on TCG run it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Crowded Crypt

Eternal Might - Aetherdrift Commander, led by Temmet, Naktamun's Will
Undead Unleashed - Midnight Hunt Commander, led by Wilhelt, the Rotcleaver

Commanders that run Crowded Crypt most

Deck counts from EDHREC.

Wilhelt, the Rotcleaver: 11,253 decks
Temmet, Naktamun's Will: 7,513 decks
Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel: 3,520 decks
The Scarab God: 3,226 decks
Varina, Lich Queen: 2,591 decks
Teysa Karlov: 1,910 decks
Ghoulcaller Gisa: 1,829 decks
Hashaton, Scarab's Fist: 1,817 decks

Often played with Crowded Crypt

Cards that show up in the same decks on EDHREC.

Rulings

2021-09-24: Decayed does not grant haste. Creatures with decayed that enter the battlefield during your turn may not attack until your next turn.
2021-09-24: Once a creature with decayed attacks, it will be sacrificed at end of combat, even if it no longer has decayed at that time.
2021-09-24: 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.”
2021-09-24: Decayed does not create any attacking requirements. You may choose not to attack with a creature that has decayed.