Ravenous Hatchling

Whenever you put a +1/+1 counter on Ravenous Hatchling, untap it.
Whenever a creature dies, put a +1/+1 counter on Ravenous Hatchling.
{t}, pay 2 life: Put a +1/+1 counter on Ravenous Hatchling.
{r}{g}: Ravenous Hatchling fights target creature.