Rakdos, Lord of Anarchy

Flying, trample
Bloodlust (This creature gets +2/+0 for each -1/-1 counter on it. Whenever it attacks or blocks, put a
-1/-1 counter on it.)
Each other creature you control with a -1/-1 counter on it has first strike.
At the beginning of your end step, put a -1/-1 on each creature.