pokemon painter card Psyduck Painted Pokémon S H I N Y

I hear plenty

It seems more like a flavorful choice than a good one

You can then take one of those cards and play it for free so long as they stay exiled, spending mana as you please, so you can cast spells that dont match your Commanders color identity

Scion of Halaster could possibly work since it helps filter your draws and recuperate lost lands, but thats about it

Individual cards from these sets will continue to be legal in any format in which they are already legal

Use your big mana, big creatures for overpowering damage and it's OK to surprise players with an occasional win from a late Exsanguinate or Choose Your Weapon