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I also have to wonder if the upcoming release of Destined Rivals has done something for these cards

(Your artifacts can help cast those spells

Mary & Professor's Research: Search your opponent's hand and remove important cards needed for their strategy

Theres also the [All Turns] effect that can make the opponent play a Petrification Token whenever one of the opponents Digimon is deleted, or the opponents Security cards decrease

Given Gardevoir is one of the most popular Pokmon in the franchise, its likely that this cards value will retain value quite well

Presumably, he's not playing a deck with Black or White cards, huh