Horrid Hydra

Undergrowth -- Horrid Hydra enters the
battlefield with X +1/+1 counters on it, where X
is the number of creature cards in your graveyard.
{b}{g}: Put a +1/+1 counter on Horrid Hydra.
{t}, Remove three +1/+1 counters from Horrid
Hydra: Return target creature card from your graveyard to the battlefield.