Arch-Mage of Stars.

+2: Draw a card. If it's an artifact, draw another card.
-4: Take control of target creature enemy controls for 4 turns, if it kills an enemy creature during this period, Scry 2.
-7: Pick one: Summon 2 4/4 Dragons with Flying and Haste. Or. Deal 5 damage to target player and all creatures he or she controls.