
Bestow {2}{B}{B} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached.)
This creature and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.
Nighthowler has 8 printings, first in Theros (2013). EDHREC ranks it #4,493 among Commander cards. It appears most in Captain N'ghathrod decks (11,510 on EDHREC). 3 public decks on TCG run it. It has 6 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.