Dragon's Grave

{1},{t}: Add {b} or {g} to your mana pool.
{t}, Sacrifice a Creature: Add {b}{g} to your mana pool and put a 2/2 Zombie Creature token onto the battlefield
It has been said that the rotted bones of an blood thirsty dragon lie there. His cursed soul still glides around, and if you please him with a blood filled ritual, he may give you some of his beloved treasures... and well...a zombie...because...why not.