Sephylon, the Ultimate Timelord #GLD5-EN029

LightMonster

Cannot be Normal Summoned or Set. Must be Special Summoned (from your hand) by having 10 or more monsters in your Graveyard, and cannot be Special Summoned by other ways. Once per turn: You can Special Summon 1 Level 8 or higher Fairy-Type monster from your hand or Graveyard, but its effect(s) are negated and its ATK becomes 4000.