That said it's still a great deal in the right deck if you want to invest that kind of cash
The useful Sapphire cards help the Ruby characters become powerful pawns that can easily be manipulated using the two Tamatoa character cards and the strong Sapphire Coil item
Mill never had the right support to dominate any format, and if the milling failed, the mill deck would be too far behind in the game and lose but in Commander, even with 99-card decks, mill might work with creatures like Bruvac, the Grandiloquent around
She also has far and away the best experience counter ability of all commanders
It wont replace Spara's Headquarters any time soon, but this web-slinging land will be great in landfall or blink decks
That kind of trade-off is usually worth it, especially since Ketramose is hard to remove and comes with menace and lifelink to help stabilize once its ready to attack