Swarm Rotfrog

Undergrowth- When Swarm Rotfrog enters the battlefield with X +1/+1 counters on it for each creature in your graveyard.
Landfall- Whenever a land enters the battlefield
under your control, put a +1/+1 counter on
Swarm Rotfrog. If it has a Golgari watermark,
also gain one life.
Ahhh... the smell of rot!