The affected cards span several sets including Base Set, Base Set 2, Gym Heroes, Gym Challenge, and Legendary Collection
Non-foil versions can be found replacing a common or uncommon within Set Boosters and in a dedicated slot in both non-foil and traditional foil in Collector boosters
The mistake was never fixed within that print run, which turns the artwork into an edition marker
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In the additions , we again have 3 cards with 4 copies each, totaling 12 outsiders : all Common, therefore very accessible
If you want to build around Egon in mono-black, then there are more than enough payoffs, too