The cut is almost surely some of the previously mentioned Sam Black resource conversion stuff, and the empty sideboard slots are likely best as Collective Brutality
I know it's not for everyone, but if you like powerful rares, there are some rad ones like Cool but Rude, The Ooze, and Splinter's Technique
Maliss P
This specific card, described as the Holy Grail of Pokmon, was for a long time thought to be the only PSA 9 to exist, submitted by Pratte himself after he added it to his collection in 2011
Although they are over twenty years old, they are not as rare as 2nd Edition Pokemon cards, and therefore they are less valuable
Matte: Matte sleeves have a subtle, satin-like texture that reduces glare and fingerprints and adds extra grip for easier handling and shuffling