Neerg Hawk

Chosen one {1}{g} (You may cast this creature for its Chosen One cost if you sacrifice either a green creature or a bird creature while casting it)
Whenever a creature enters the battlefield, put a +1/+1 counter on target creature until end of
turn. Whenever a creature under your control ties in a fight, you lose 1 life. Whenever you gain life, put a +1/+1 counter on target creature until end of turn.