It makes combat with multiple equipped creatures treacherous for opponents, and can switch things around at instant speed to help protect your key pieces
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With this in mind, it seems unlikely that Glorious End will show up in the main deck, but it could be a sideboard option for specific matchups (it's a hilariously effective way to win the mirror)
The official rules can be found on our rules page
Looking at this, I thought a lot about the most recent set excluding Final Fantasy, Tarkir Dragonstorm, and how this card fits in so well with those recently released decks and strategies
It transforms not unlike a double-faced flip card