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Shaddoll Fusion reads: Fusion Summon 1 Shaddoll Fusion Monster from your Extra Deck, using monsters from your hand or your side of the field as Fusion Materials
For example, if Clive's Hideaway's hideaway ability is copied and two cards are exiled, you may cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) Gogo's ability can copy any activated or triggered ability on the stack, not just one with targets
The key thing to note is that there are Pokemon Center exclusive elite trainer boxes that do not have a stamped promo, so be sure to check that your Pokemon Center exclusive Elite Trainer Box is from a set that is from the Scarlet and Violet era
After a certain amount of level counters, creatures gain more power, toughness, and often more abilities