Quote from Macabre »The issue it causes players is when the pilot is slow at math, not what the card adds to the game. The fix to this problem is helping your friend, not banning a card.
I don't think most people are slow at math. Paradox Engine does a lot of things, and in a giant game of Commander, there are going to be a lot of moving parts. And a lot of it will include unknown information, such as drawing cards, and pre-planning actions gets harder.
To simplify things down to "people are bad at math" is quite honestly rather insulting, and a serious oversimplification of this game.
I have yet to see or hear a single good excuse for unbanning painter. There are other cards on the banlist that can be set free. The before mentioned panoptic mirror, which is terribly slow compared to what kefnit+turns is capable of doing now. If they want to keep the list short, then unban braids, because banning a card using mtgo as an excuse was silly. Why not gifts ungiven (because intuition isn't), biorhythm when we have shaman of forgotten ways, or coalition victory which fails to a creature removal spell or strip mine and we have approach the second sun which is far easier to control?
Really why did they choose painter when there are multiple other safer options.
Do any of these 'safer' options actually add anything to the game though? I don't know about you, but none of those seem exciting to me to build up, compared to the danger they add.
Painter's seems to have some added danger to being let loose, notably Ugin and All is Dust, but in that sense it compares to Enchanted Evening and Mycosynth Lattice. On the flip side though, it's been something a lot have been wanting, for some kooky color-matters shenaningans. Time will tell if it gets to be problematic, but it should likely be ok.
That said, I see no way in which Biorythm is a 'safe' unban. Shaman requires a lot more set up (haste, and a lot more creatures/power) to even come close to having the same effect.