Her passive ability is one of the best ways to consistently generate energy, even from spells that dont normally generate any
And finally, her -7 simply gives the player an unfair card advantage that lasts for the rest of the game
This keeps the initial experience much easier to grasp, while ensuring that the players will learn all of the game by the time they have gotten all the packs.
Arnos option to be cast facedown as a disguised creature is fine in an environment with other face down creatures, but it's basically useless if Arno's your Rakdos commander
Im not sure these are going to be the best to bring newer commander players in on, but with guidance I think that they could be enjoyable decks for them as well
Astrologian's Planisphere: This is actually from the mainline Final Fantasy set, but it has potential in Constructed formats as a spells payoff, so theres a chance itll spike in price at some point