Kozilek, Untouched by Man

X: Discard X amount of cards, you draw half that many back (round up)
-3: Pick a card from an opponents hand, exile that card, you get a 1/1 Eldrazi Scion with "Sacrifice this creature: add {1} to your mana pool"
-12: You get an emblem with "Whenever you draw a card, do 5 damage to target opponent, at the end of your turn, draw a card for each tapped Eldrazi"