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You can only use pre-built theme decks, which can be bought for pretty cheap, even with in-game currency

Use Lunatone to fuel your discard with energy to power up Ceruledge exs Abyssal Flames while also drawing cards and Solrock to take easy knockouts against basic Pokemon HP or bigger Pokemon with damage already on them

The only decks you might not want to run these two are reanimator decks, but otherwise

Its Chaos Control ability makes every spell you cast with artifact mana essentially uncounterable thanks to split second

Theres likely plenty of times you can cast Ghalta, Primal Hunger for only 2 mana in a creature-heavy deck, leaving you extra mana to try to protect it with cards like Heroic Intervention or Mithril Coat