Sephylon, the Ultimate Timelord (BLRR-EN056) [Battles of Legend: Relentless Revenge]

Cannot be Normal Summoned/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 effects are negated, also its ATK becomes 4000.