Omega Supreme, Guardian

Defender, Reach, Hexproof

Whenever you or another creature you control
takes damage. Put a +1/+1 counter on Omega
Supreme, then Omega Supreme deals X damage
divided as you choose to any number of target
creatures your opponents control where X is the
number of +1/+1 counters on Omega Supreme.
If X is 3 or more convert Omega Supreme.