Then you can finish off with a good, old-fashioned Fling
In general, if you have a cheap removal spell in hand, its fine to give it the two +1/+1 counters
For context, that means each pack in the box goes from $5.49 down to $4.66
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
While the power level of creature-based decks has grown, control has fallen a bit behind
Im definitely always in favor of cards that can punish the prevalence of green ramp and this one offers a tangible reward in the form of your own temporary mana acceleration