Ultimate Dragon of Pride and Soul [ROTA-EN000] Quarter Century Secret Rare

3 monsters with 2500 original ATK and DEF
This Fusion Summoned card cannot be destroyed by your opponent's card effects, also your opponent cannot target this Fusion Summoned card with card effects. While you have 25 or more cards in your GY, this Fusion Summoned card gains 4500 ATK/DEF. Once per turn, if your opponent has 25 or more cards in their GY: You can destroy all cards your opponent controls.