6eeba363_onsters___Yu_Gi_Oh__Card_Guide__Card_Text
[Card Name] Raviel, Lord of Phantasms [Type] Effect Monster [Attribute] DARK [Sub Type] Fiend [ATK] 4000 [DEF] 4000 [Card Text] 
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.
Yu-Gi-Oh! Level 10 Monsters - Yu-Gi-Oh! Card Guide