Merli, Spawn of Ulamog

+2: Put two 0/1 colorless Eldrazi Spawn creature tokens onto the battlefield. They have "Sacrifice this creature: Add {c} to your mana pool."
-6: Colorless creatures you control get +2/+1 and gain Trample until end of turn.
-20: Search your library for any number of Eldrazi cards, exile them, then shuffle your library. You may cast them without paying their mana costs.