Raviel, Lord of Phantasms (Ultra Rare)

Cannot be Normal Summoned or Set. Must be Special Summoned (from your hand) by Tributing 3 Fiend-Type monsters, and cannot be Special Summoned by other ways. Each time your opponent Normal Summons a monster(s): Special Summon 1 Phantasm Token (Fiend-Type/DARK/Level 1/ATK 1000/DEF 1000) for each monster Summoned. These Tokens cannot declare an attack. Once per turn: You can Tribute 1 monster, this card gains ATK equal to the original ATK of the Tributed monster, until the End Phase