opponents can cast spells only as though they were sorceries and can attack teferi as though he were you. put 4 loyalty (use counters) on teferi. any damage he suffers depletes that much loyalty. if teferi has no loyalty, he abandons you. during your turn, you may add 1 loyalty to allow you to cast sorceries as though they were instants until your next turn; or you may spend 3 loyalty, then the owner of target artifact, creature, or enchantment returns it to hand and you draw a card. any enchantments on it are discarded.