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
What are the Rise of the Floodborn starter decks
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
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
(If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead.) Legendary Creature - Human Cleric Creature (CTRL to add secondary) Instant Instant (CTRL to add secondary) Sorcery Aerith Rescue Mission Choose one Take the Elevator Create three 1/1 colorless Hero creature tokens