mill 3 cards mtg card Blue Black Mill Deck - Mind Grind - MTG Magic the Gathering The Miserable Mill | MAGIC:

This thing too nasty to deal with and I am a bit shocked that it was printed as is without additional brakes, but Wizards has been printing overly powerful Commander-legal cards a lot recently that do too much

And beyond the subtype, their mechanics vary wildly, so very few of them function well with Jenova

Yzma, Scary Beyond All Reasons ability makes her worth the cost alone, but she wont go to waste once shes entered the field, either

We can leave our mana up, if we need to counter something we use Mana Tithe, but if we don't get a chance to use the counter we can use our mana to cast one of our instant-speed token producers

Putting counters on creatures is fairly trivial to do, as is casting cards from places other than your hand, and even a bad Seedborn MuseSeedborn Muse in the command zone sounds pretty good