X'olbgos, the Great Lie

Deathtouch, Menace
Whenever X'olbgos attacks, each player sacrifices
a creature. Create a 2/2 black Zombie creature
token tapped and attacking for each creature sacrificed this way.
Whenever a player sacrifices a creature, put a
+1/+1 counter on X'olbgos.
Remove two +1/+1 counters: Create a tapped
2/2 black Zombie creature token.