Warblood Hydra

Haste, warcry (Whenever this creature attacks, put a +1/+1 counter on it. At the beginning of your end step, if it didn't attack, remove a +1/+1 counter from
it.)
Warblood Hydra enters the battlefield with four +1/+1 counters on it.
"It lives on wars, and dies on war. It eats war too.
It is war. And without war, battle and strife, it is nothing. Let this teach you peace."