You might not expect it to be the Dragon-focused colors, but it actually has a lot of great options with them: red and black
There's a full 21 combos available with this deck list, according to Commander Spellbook, so we'll often look to assemble a combo win with this list
Of course, the core MTG rules don't allow players to control each other's actions, but Mindslaver changes all that
A colorless source of fixing is a nice thing to have around, and this format has enough multicolored stuff going on that solving this isnt impossible, and obviously the Case itself increases your chances of having a deck that lets you solve this, but I still think this will be hard enough to solve that most of the value just comes from its ability to fix your mana, with some occasional late-game upside
Activate this ability only once each turn. If this ability of the Shapeshifter is activated, the Shapeshifter will be destroyed at the beginning of the next end step, even if its no longer a copy of Crazed Armodon at that time