Immersturm Predator can easily get +1/+1 counters while hating on the graveyard and being incredibly difficult to kill Alongside Exava, Archpriest of Shadows and whatever she puts her Backup counter on is way more likely to get in for a hit because of Haste
Faerie Mastermind is my pick for breakout, cross-format all-star in the set, and this deck can take full advantage of him even using his activated ability alongside Sheoldred, the Apocalypse to close out games
It also cant be blocked by anything with more power than it
Also exiling is the preferred method of removal for casual formats like Commander since it gets past indestructible things like Darksteel Plate, tricks like Heroic Intervention, and it permanently ends their threat, and they cannot be recurred
Thanks to Multiversal Incursion, it's now possible to build a deck that copies itself infinitely, and it's as hilarious as it sounds
Force of Will would have been atrocious in the current Modern metagame, enabling the linear combo decks in ways that would have made it impossible for a lot of aggressive and midrange strategies to combat