Corpse Spire Garden

{t}: Add {c}
{t}{p/b}: Sacrifice a creature and put a death
counter on Corpse Spire Garden.
Add colorless mana to your mana pool equal
to the power of the sacrificed creature.
{t}{p/b}{p/b}{p/b}: Sacrifice Corpse Spire Garden
and destroy all creatures with Converted mana
cost equal to the number of death counters on
Corpse Spire Garden