While decks rarely splash energy in favor of going all-in on the mechanic, you can whip up some powerful and interesting brews, especially in Commander
Proliferate works best if you have a big board of creatures with counters on them, so it seems like hed be a slam dunk in go-wide and counters strategies, but the problem is that most popular commanders for those archetypes are key to the decks strategy and want to avoid danger by any means necessary
If you buy a sealed booster box with a full 36 packs, 10 cards each, there is a chance you dont pull any Special Illustration Rares (SIR), Ultra Rares (UR), Hyper Rares (HR), or even Illustration Rares (IR)
can serve as a powerful way to finish games
Mickey Mouse - Musketeer has a special ability that gives any other Musketeer cards in the player's hand +1 ink
That being said, at just three mana, Tezzeret, Cruel Captain may be cheap enough so that incremental value over the course of a few turns may be powerful enough