Kaiki the Unity Star (BLRR-EN038) [Battles of Legend: Relentless Revenge]

If this card is Special Summoned: You can pay 500 LP; Fusion Summon 1 Warrior Fusion Monster from your Extra Deck, using monsters from your hand or field as Fusion Material. During your opponent's turn, if you control a Level 5 or higher Warrior monster whose current ATK is different from its original ATK (Quick Effect): You can Special Summon this card from your GY. You can only use each effect of "Kaiki the Unity Star" once per turn.