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However, as with anything else, the value of your cards still depends on the market forces for supply and demand

Tom Marks is IGN's Senior Reviews Editor

Doduo 084 Reverse Holo 151 Sluttid2 aug 12:36

A collector may deem a card valuable if its from an older set, if it contains nostalgic value for them, or if its increasing in monetary value over time

He would deck you by playing Swords to Plowshares to remove all your creatures from the game, thus shrinking your library so that he would eventually deck you

Again though, these "one-card armies" can be easily put down, especially in the current meta, which has focused more on Field control