Onyc Swarm

Flying
Every time Onyc Swarm deals combat damage,
put a Chance Counter on it.
Remove three Chance Counters from Onyc
Swarm; Put a Mega Rabes counter on target
creature.
(A Mega Rabes Counter states that: "Whenever a
player draws a card, deal one damage to you.
{t}; Sacrifice this creature, draw a card")