Someone I know failed an algebra exam for using calculus to get the vertex of a parabola. It’d be one thing if the reason was that it wasn’t a method that was taught yet, but the teacher straight up didn’t know any calculus and failed them by saying it was nonsense.
I can think of a few things I dislike about MTG as a whole (3yr standard and general powercreep of the format comes to mind), but my complaints about specifically Arena would be: