Slithering Bog

Fleshcraft - Slithering Bog enters the battlefield
tapped unless you control three or more
creatures.
{t}: Add {b}.
{3}{b}: Until end of turn, Slithering Bog becomes
a 3/3 black Horror creature with menace and has "Whenever this creature attacks, exile target card
from defending player's graveyard." It's still a
land.