Yawnaw, Whirling Croc

Evolution {4}{g}{u}
Water Veil (Whenever a creature enters the battlefield under your control, you may give it hexproof until end of turn.)
Whirling Strike: Whenever Yawnaw, Whirling Croc attacks, you may tap target creature an opponent controls. That creature doesn't untap during its controller’s next untap step.
Evolution Bonus: If Yawnaw evolved from Yantodile, put two +1/+1 counters on it.