As long as neither player is manipulating their library or using their graveyard, using a Millstone does nothing but reveal information until the player being milled runs out of cards, but it took more explanation than you can possibly imagine to make players understand this
Tromell, Seymours Butler* I dont really remember Tromell, but this card is a good fit for +1/+1 counter decks, especially for those that want to go wide, and in elf-ball decks
Witherbloom Withering Curse This is the card that makes what Witherbloom is trying to do make sense
History suggests that you'll have to act quickly to get these in your cart
There is an argument to be made about the Final Aeon possession also being part of this mechanic, but I am not really so sure
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