Orochimaru, the Exiled

Indestructible, Ward {2}
Whenever Orochimaru, the Exiled enters the battlefield, create X black and green 2/1 Snake creature tokens with deathtouch, where X is
the number of creature cards in your
opponents' graveyards.
Whenever a snake creature you control dies,
target opponent sacrifices a creature.
"You know how the game of chess is played...
pieces must be sacrificed!"