disney 100 joyful booster box [Bonus] Weiss Schwarz Pack, of 16 Packs : Toys & Games This box contains 10 booster packs CardFun - Booster Box -

If a Song-focused Amber/Steel deck is more your speed, there are some possible additions here as well

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Rockets Sneak Attack A disruption card that lets you pick a Trainer (so any Trainer, Supporter or Stadium) from your opponents hand and have them shuffle it back into their deck

Or just winning outright

One-off sales can be caused by flukes of circumstance or particularly urgent buyers, so valuing a Mewtwo card is more appropriately done by looking at their average resale value on sites like TCGplayer and PriceCharting (all listed prices are from the time of writing)

2 acrylic condition markers and 1 acrylic TAG TEAMGXmarker