Pawn shops are another option, though its best to go in with a clear idea of what your cards are worth since their offers vary
Psy Shadow allows you to place an extra Psychic Energy on the Pokmon in the active spot which is necessary for Psydrive as it costs 4 energy and discards two energy per use
Once you've built up your collection, you can build a variety of decks using 20 cards, then battle other players or challenge NPC trials
Private Office // Lecture Hall Private Office at 2WW is an overcosted conditional board wipe, period
Other more pricey options include Expedition Map, Bitter Triumph, Living Death, Nihil Spellbomb (0.99), Diabolic Intent, Liliana of the Veil, Angrath, the Flame-Chained, Stalactite Stalker (1.49), Bloodletter of Aclazotz, and the Monarch making Court of Ambition