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It's also the last Extra Deck monster Yusaku summons to defeat Ai

Special Summon 1 "Galaxy-Eyes Photon Dragon" from your hand or Deck, then change the attack target to it, then you can attach this card from the GY to 1 Xyz Monster on the field as material

Kashtira Riseheart X FIRE Level 4 [ WarriorEffect ] ATK 1500 DEF 2100 If you control a "Kashtira" monster: You can Special Summon this card from your hand, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Xyz Monsters

They are also comprised of "Alpha", "Beta", and "Gamma", all of which are required to Special Summon "Berserkion the Electromagna Warrior", a retrain of "Valkyrion"