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This will make Aerodactyl ex a great addition to most Fighting decks

Key to the City offers a lot indeed but it does have some subtle issues

Once per turn, by detaching one of its Xyz materials, it can destroy all the opponent's face-up monsters with attack points less or equal to its own

[1] When your opponent activates a monster effect while this card has material (Quick Effect): You can negate that effect, and if you do, destroy it, then inflict 1000 damage to your opponent

Big is the name of the game as Brudiclad asks you to make as many tokens as possible and then convert them all into a gigantic game-ending threat