I have no familiarity with M:TG, so any reference to it is lost on me, although I did imagine there must be some element of it in here. Obviously the final act with painter guy is a love letter to Yu-Gi-Oh, but I've always wondered what the other games are meant to be.
Oh I do agree that the twist that P03 is trying to use you to upload the game onto the internet is actually a great twist by the way. I knew I would forget something.