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Having to run a Gem-Knight monster is the con as it is quite dead in hand leading to the terminology of referring to non-synergistic 1-ofs as "Garnets" of the deck

You can only activate 1 "Subspace Battle" per turn

(Gengar and Dragonite, I'm looking at you both right now...) You should add the possibility to Pokemons have more than one weakness and/or resistance

(Granted, it isn't on ours, but there are plenty of variations in which it is.) If Miraidon ex keeps pulling out your Water-types, that's bad

You can only use this effect of "Zapdos, Envoy of Thunder" once per turn

This is also a great way to safeguard some of your own enchantments from exile removal, or reuse them if youre playing Sagas