Utahraptor

Haste. First Strike.
Whenever Utahraptor attacks you may {t} target creature opponent controls with power equal or less than Utahraptors.
Whenever a creature with less power than Utahraptor enters the battlefield under your control put a +1/+1 counter on Utahraptor.
Intelligent, fast, cunning, lethal. These raptors are nature's masterpiece.