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There are also specific match-ups that Porygon-Z is straight-up bad in

Esika, God of the Tree is one of those MDFCs that you care much more about the back than you do the front

That would stop Snake-Eyes Poplar from being added to hand, and also prevent its effect from bringing out Snake-Eyes Flamberge Dragon

Arceus (Lightning) I added the Lightning Arceus into the deck to help do increased damage to Gyarados, Kingdra LA, and Kingdra Prime

English cards are also the standard for official play in most regions outside Japan, which maintains demand among competitive players though tournament-legal cards are usually newer prints and not the ones that become ultra-valuable collectibles