I bought someone's Juan collection of 3000+ cards and various other bits. I knew some of what was in it but bought most of it sight unseen. Didn't know about any of these error cards though.
It has put me over 2000 different cards now.
My methodology on error cards is that I will add any error variation that I know exists, either by having it, seeing it on eBay, or another respective Juan collector tells me that it exists.
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