Whether or not Venerated Rotpriest ends up a four-of in Infect reminds to be seen - usually Im the guy dying to Infect, rather than killing opponents with poison counters, so I'm not an Infect expert by any means, but at a minimum the new one-drop offers enough upside and unique lines that Infect players will try it, and I wouldnt be surprised to see some number of Venerated Rotpriests stick in the deck
Edges and Corners
Last year saw the release of the Universes Beyond: Doctor Who set for Magic: the Gathering, which included 188 new (and mechanically unique) cards based on various doctors, companions, villains, and other characters from the long-running TV show(s)
The only thing keeping it from being the best is the lack of complete dominance the other decks have had
There are standard and foil versions of each of the 50 cards, all of which contain the Pokmon 25th logo
Theres actually a ton of other examples already of individual Wilds cards being picked up as incremental upgrades for familiar decks: Up the Beanstalk in Atraxa decks that play Leyline Binding