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I genuinely think Future decks might run a copy or two of this little fella.
>Future Booster gives free retreat, deck will be running a metric ton of switching effects on top of that to activate as many Iron Valiants as possible
>Costless move means no need to accelerate to it, since Future cards seemingly have expensive moves this is a plus
>Using it to heal up Iron Valiant or Iron Hands, even if it gets KO'd the next turn, is better than those EXs getting KO'd instead
Alternatively if there's a deck that REALLY likes Gorgeous Mantle to make something bulky, this can work the same way for them.
