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Outside of mechanics are the cards themselves

Certainly having Stoneforge in your deck makes the Batterskull vastly higher power and likely the most wanted card on this list

Learn more about how ranked matches work in Pokmon TCG Pocket below

I only play two copies here, but a third copy could definitely be justifiable

Squirtle [Blue Back] #7 Pokemon Japanese Topsun Keep track of your collection value over time

Going even more all in on cloning by replicating copies of a card with myriad like The Master, Multiplied , or you're brutally sapping the resources of your opponents by copying Lord Xander, the Collector , there are all sorts of creative choices of creatures to copy