Raviel, Lord of Phantasms

This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 3 Fiend-Type monsters. Each time your opponent Normal Summons a monster(s), Special Summon 1 "Phantasm Token" (Fiend-Type/DARK/Level 1/ATK 1000/DEF 1000). This token cannot declare an attack. Once per turn, by Tributing 1 monster, this card gains ATK equal to that monster's original ATK, until the End Phase.