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In fact, Yugi used this ability in the anime to save himself from an attack from Obelisk the Tormentor , so its been put to good use

By detaching an XYZ material from this card, you can take control of one of your opponents face-up monsters and effectively transform it into another Galaxy Eyes Cipher Dragon , changing the cards name and boosting its attack to 3000

Generation Next X SPELL Quick-Play If your LP are lower than your opponent's: Add to your hand, or Special Summon, 1 "Elemental HERO" monster, "Kuriboh" monster, or "Neo-Spacian" monster from your Deck or GY, with ATK less than or equal to the difference in LPs, also for the rest of this turn, you cannot activate cards, or the effects of cards, with the same name as that card

This puts a stop to any deck that needs graveyard effects and can even guarantee a win