Maze of the Master

If you control a "Galaxy-Eyes Tachyon Dragon" monster, you can activate this card from your hand. During the Battle Phase: Detach 1 material from your "Galaxy-Eyes" Xyz Monster; shuffle all monsters your opponent controls into the Deck that were Normal or Special Summoned this turn. If you control a "Number C" monster, this card's activation and effect cannot be negated. You can only activate 1 "Lord of the Tachyon Galaxy" per turn.

Lord of the Tachyon Galaxy

If this card is added to your hand, except by drawing it: You can Special Summon this card. You can Tribute this card; Special Summon 1 "Tachyon" monster from your Deck or GY, except "Tachyon Cloudragon". If you Special Summon a Dragon Xyz Monster(s) (except during the Damage Step): You can target 1 of them; attach this card to that monster, from the GY (if it was there when the monster was Special Summoned) or hand (even if not), as material. You can only use each effect of "Tachyon Cloudragon" once per turn.