I hope you enjoy!
The calculator rates absolute power, not relative matchups
The Mind Stone The Soul Stone is already seeing plenty of play in Standard, so The Mind Stone should see some play, too
You can certainly play Commanders with Polymorph/Scramble elements that aren't dedicated to the strategy, such as with Neera, Wild Mage or other similar 'hit a big thing' decks, but the power behind playing a dedicated, limited choice for what you intend to hit off of a flip can greatly boost a deck's capabilities, and win games out of nowhere
It seems kind of wishy-washy in hindsight, but if you read the initial articles, youll see that I went into much greater depth on where and when I thought each price would go
(See "Partner," below.) This means you don't have to draft The Prismatic Piper to play with it