You just build or import a deck, then find or host a lobby to play online
Theres been some examples that dont use the standard back design, and Japan has its own version, but international Pokmon cards follow the same format
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I agree that it might be better in decks with additional one drops an im lookong forward to see if black will replace white as a splash color (or be addet to the deck) The other card is absolute garbage It can be dead, opens you for two for ones and requires a creature to do anything
For the mythics, its a touch more complicated
These decks have likely been used in tournaments already