mtg assassin's creed booster box Assassin's Creed Booster Box

Their effects allow a player to Rank-Up an Xyz Monster, meaning an Xyz Monster with a Rank higher than the target (and often the same Type) is Special Summoned from the Extra Deck, with the targeted Xyz Monster and its Xyz Materials both becoming Xyz Materials on the newly Summoned monster

One booster

Or manipulate the very fabric of reality and shove your opponents most potent threats through it

Losing 4500 Life Pointsandusing your treasured Blue-Eyes Ultimate Dragon you went to great pains to Fusion Summon was nigh-on impossible to come back from in early days of the game

You cannot activate any Spell Cards the turn you activate this card, except "Spellbook" Spell Cards.