Enyo, Tainted City

{t}: Put a -1/-1 counter on Enyo, Tainted City.
Remove a -1/-1 counter from Enyo, Tainted City: Add {b} or {g} to your mana pool.
Sacrifice Enyo, Tainted City: Search you library for a creature with power or toughness equal to the number of -1/-1 counters on Enyo, Tainted City, reveal it and put it into your hand. Then target creature gets -X/-X where X is the number of -1/-1 counters on Enyo, Tainted City.