In just about every way, serialized cards were identical to other premium counterparts also available in the set (in this case, the parallel printing was the Retro Schematic treatment), with the only difference being that serialized cards carried with them a numeric stamp indicating which card out of 500 they were, as well as a special Double-Rainbow foil effect
Prismari Pledgemage was first released in the set Strixhaven: School of Mages, illustrated by Marta Nael
Sideboarding To reduce the amount of scrolling required, heres a refresher on my current sideboard: A good number of the one-ofs in the deck are selected more carefully than one might think, applying Zvi Mowshowitzs The Elephant Method*, featuring cards that one may expect to be included in the maindeck (looking at Grim Lavamancer, Price of Progress, and Force of Will specifically)
There are several factors that contributed to why this particular card went for so much
At level 7S with no material specified, it has effects related to advanced and above
You should be able to click it to see it fullsize