Just Me and You

When Just Me and You enters the battlefield exile all graveyards and all nonland permanents, your life total becomes 50. At your upkeep you loose 8 life. Just Me and You is Devoid. Sacrifice a land: play a spell from your hand without paying its mana cost, if it the spell was a permanent then it enters the battlefield under target opponents control and Just Me and You does damage to them equal to that permanents converted mana cost.