If your deck is more aggressive, your average mana value will skew lower
Mirror Entity is probably my best suggestion as a way to set yourself up to be able to swing with a bunch of one and 2-power Pirates, hopefully get them in "under the door" against an opponent without flying/reach blockers and then you use Mirror Entity to make them as large as possible before applying damage
18 Ezuri, Stalker Of Spheres Move Those Counters Taking proliferation to the extreme is Ezuri, Stalker of Spheres
However, that comes with two disclaimers
Whenever a creature with power 1 or less is put into your graveyard from the battlefield, you may return that card to the battlefield at the beginning of the next end step if Shirei, Shizos Caretaker is still on the battlefield. Basically, youre going to fill the deck with cards like Viscera Seer, Zulaport Cutthroat, Yaroks Fenlurker, and Big Game Hunter, and just recur them for all of time until you win the game through sheer force of will and the little people fighting back
Commander Mizzix of the Izmagnus Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter
