Double Cipher (MP17-EN158) [2017 Mega-Tins Mega Pack]

If your opponent controls a monster with the highest ATK on the field (even if tied): Target 1 "Galaxy-Eyes" or "Cipher" Xyz Monster you control that has Xyz Material; detach all Xyz Materials from that Xyz Monster, and if you do, Special Summon 1 monster from your Extra Deck with the same name as that Xyz Monster.