Teysa, Hauntbringer

Other creatures you control can't leave the battlefield. (can't be destructed, exiled or sacrificed. Can't return in hand or in library. Making their toughness drops to 0 doesn't cause them to die.)
{1}{b}{w}{w}, discard a card: Until end of turn, Teysa, Hauntbringer loses all abilities, and gains Hexproof.