I mean, aside from the Baron, but I'm an Old Fogey for liking him so much, Reserved List or no
Many names of spells, effects, and items come straight out of a Dungeons Masters Guide or Players Handbook: Lightning Bolt Crystal Ball Fireball Phantasmal Forces Clone Invisibility Fabricate Ball Lightning Erase Fear Misdirection Jump Simulacrum Sleep Web Sunstone Shatter Visions Wall of Fire Wall of Stone Wall of Ice Wall of Sand Wall of Bone Pyrotechnics Ice Storm Reincarnate Descent into Madness Dehydration Brand Chain Lightning Entomb Dominate Animate Dead Teleport Resurrection Raise Dead And then you have similar effects like Phantasmal Terrain instead of Hallucinatory Terrain or Phantasmal Mount vs Phantom Steed, Fly vs Flight, etc
Or annoying your opponents when all of your creatures have the ability of Maze of IthMaze of Ith
If that were the case for my deck above, I'd add four Tundra, three Underground Sea and two Scrubland in place of the basics and go more control, as playing Moat and Disenchant would be practically free (not many Blood Moons in the format)
So, even if Proxy King is legit and the cards look great, that does not make them legal for sanctioned tournaments
might not seem like a real cost.