Yharim's serpent

+3: Sacrifice a non-land permanent you own. Deal damage equal to its converted mana cost to target creature or planes walker and gain that much life.
-X: Draw X cards and put as many non-land permanents on the battle field as you want with converted mana cost X or less for free. Gain X life.
-20: Search you library and graveyard for any number of cards named Emrakul, Kozilek, and Ulamog and put them on the battlefield for free.