The Door of Destiny (Prismatic Secret Rare)

When an opponent's monster declares a direct attack: Negate the attack, then Special Summon this card as an Effect Monster (Fiend-Type/LIGHT/Level 1/ATK 0/DEF 0). (This card is also still a Trap Card.) During your Standby Phase, while this card is treated as a monster: You can banish any number of Utopia monsters with different names from your Graveyard; inflict 500 damage to your opponent for each of those banished monsters, and if you do, this card gains ATK equal to the damage they took.