Hungry Pigeon

Flying
{1}{g/u}{u}: Untap Hungry Pigeon.
{t}, {g}: Put a +1/+1 counter on Hungry Pigeon.
{t}, Sacrifice a Saproling: Put 3 +1/+1 counters on Hungry Pigeon.
{t}, {2}{g/u}{g/u}, Remove 6 +1/+1 counters from Hungry Pigeon: Transform Hungry Pigeon.