Corpse-Cobble Crab

Menace, deathtouch.
When Corpse-Cobble Crab or another Horror
you control enters the battlefield, each opponent
mills four cards.
Whenever Corpse-Cobble Crab or another
Horror you control attacks, put a creature card
from defending player's graveyard onto the
battlefield under your control tapped and
attacking. It's a purple and black Horror in
addition to its other colors and types. Sacrifice
it at the beginning of the next end step.