O-Kagachi Made Manifest is the backside of The Kami War, which isnt a legendary creature and doesnt have special criteria that let it be your commander (see: Shorikai, Genesis Engine)
Control the board with Grave Pact / Dictate of Erebos
Such two-for-ones include everything from format-defining sorceries like Hymn to Tourach to sideboard standouts like Lifebane Zombie (to cards that don't blow up the opponent's hand at all)
This can range from only having cards with an even mana cost ( Gyruda, Doom of Depths ) to having extra cards in your deck ( Yorion, Sky Nomad )
A PSA 10 sold for around $88,000 in July 2025
The artwork does such a great job communicating the horror and pain experienced by the character depicted through tiny details like their twisted hand, the way they are feeling their new porcelain face, and their too-wide eyes giving a look of terror that is contrasted by the blank expression of the mask