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A full set of Retro City Rampage cards (15) OR A full set of TF2 cards(9) + 5 random cards OR A full set of Gmod cards (9) + 3 random cards.
Knowing that the best price one could get is 2.62 EUR, I'd say between 15 and 26 cards, based on their price on the Market.
I'm more interested in those cards: Hitman, Sleeping Dogs, FTL, Worms, Really Big Sky, Defense Grid, Trine 2 and a few others, but others could do.