Nicol Bolas, Derp God

+2: As an additional cost to use this ability, destroy target Creature or Planeswalker. You gain 5 life
-3: Nicol Bolas deals 20 damage split as you choose among any number of target Creatures and Planeswalkers.
-8: Exile all non-bolas Planeswalkers and creatures. Amass one for each card exiled this way.