Key cards that youd be looking at are the likes of Ethereal Armor, which gets insane with a lot of other auras, or Blazing Shoal which you can use to make a creature huge for not much mana
If youre paying this cards full disguise cost, youre not only playing this card wrong, but youre playing your entire deck wrong
Played in the right decks, it can give you an infinite number of extra turns, steal everything your opponents control, and lock them out for the rest of the game, but there is one caveat: your opponents decide how well it goes
I do appreciate that its taking the distinct 5-color commander approach instead of fully-colorless, though the Eldrazi well has officially run dry after this one
The disguise cost on the face of the card lets you flip it face-up as a special action