This is possible, but it's not particularly likely
Several other key items, such as the card artists, card designs, and the context of the images, also all lean towards them possibly being legitimate
When fetches start settling around $10, [card]Sorin, Solemn Visitor[/card] drops to under $15, [card]Sarkhan, the Dragonspeaker[/card] fluctuates to around $20, and [card]Clever Impersonator[/card] (non-foils) tank to around $6, the non-hyped rares sitting at $2-5 will have a chance to see an increase according to how Standard settles
So that concludes our best Trading Card Games list theres plenty more games out there, but these are the ones we consider the very best.
Blech and Blex care about the same exact creature types, Blex is itself a Pest, and there is obvious lifegain overlap between the two cards