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
The life gain played by normal decks to sure up their matches against agro decks has to minimally impact the deck in their other match ups however in decks that are really abusing life as a resource such as Necropotence you typically need some life gain just to enable the continued use of your effects
The idea is to get the most bang for your buck so you can reinvest those new found dollars into MORE cards, right
Other effects that interact with putting counters onto that creature will interact with this effect accordingly
Animation Module: [Category 3] Easily one of the best engines in the Energy economy
This is the first time in a long while that WotC has balanced the cards in a cycle exceedingly well when compared to one another