Gitrog

Sacrifice an untapped swamp or forest when this enters the battlefield or sacrifice it.
Enters the battlefield tapped unless you control a black or green creature.
At the beginning of your upkeep, sacrifice a land and draw a card.
You may play land cards from your graveyard as long as Gitrog is in your graveyard.
{t}: add {b}{g} to your mana pool.

"No better place to hunt for frogs"