The color identity of your commander(s) still applies to cards like Arcane Signet to explicitly refer to color identity
Sephiroth, Fallen Hero sets your modified creatures to beefy 7/5s at base when he swings, which is fantastic if you manage to go wide
Card Draw/Manipulation Card draw and deck manipulation arent technically fixing, but they work a lot like it
Any cards that trigger when a player cycles a card will trigger when a card is discarded to pay an activation cost of a typecycling ability
The choice of planes includes Norn's Dominion because thats too ridiculous to ignore, some wacky phenomenon cards (we can have two of them), and planes that benefit from having small creatures, Naya creatures, or tribal interaction
You get the enchantment + Ghostly Prison for pillow fort decks, a good-sized vigilance creature for defense, and a creature that can attack alone and get rewards for samurai decks