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Since Mewtwo & Mew-GX can use the attacks of GX and EX Pokemon in the discard pile, its effect to discard isn't even a downside

In the US Buy Pokmon plushies (various sizes) from the Pokmon Center

Thalia, Guardian of Thraben Thalia, Guardian of Thraben often fulfills the taxes half of Death and Taxes, a strategy utilizing disruptive creatures to knock their opponents off-balance and close the game before they stabilize

For players with more time who don't want to keep the deck, I'd say look at buying singles you want and make a decision based on that

Explore the ancient region of Hisui and uncover powerful new evolutions with the Pokemon TCG: Astral Radiance Booster Pack, part of the Sword & Shield series

Check out this unboxing of the coolest cards in the Pokmon Celebrations series after that