Galactrus The All Maker

+2: Tap or Untap any Target Creature, and add a +1/1 or a -1/1 on any Target Creature.
-4: Select Target Permanent and Exile it, until Galactrus the All Maker is Destroyed or Exiled.
-20: Becomes a White 6/10 Dragon Creature with Flying, Hexproof, Indestructible, First Strike, Lifelink, Deathtouch.