River Smasher

Riot (This creature enters the battlefield with your
choice of a +1/+1 counter or haste.)
Bloodthirst X (This creature enters the battlefield
with X +1/+1 counters on it, where X is the damage
dealt to your opponents this turn.)
Bloodrush — {2}{r}{g}, River Smasher: Target
attacking creature gets +X/+X until end of turn,
where X is the power and toughness of River
Smasher.