Ragnar the Tyrannous

+2: Deal 1 damage to any creature. If the creature dies, exile it, then gain life equivalent to that creatures total toughness
-4: Exile any permanent by paying its converted mana cost. You may then cast any amount of instants equal to the converted mana cost
-15: Destroy all creatures, artifacts and enchantments on the battlefield. You may place all exiled permanents back onto the battlefield