Pretty much every EDH deck plays at least a little ramp
Notably, Sultai Arisen also breaks the trend of Spirit Dragons being awful in the precon, with Teval actually supporting the graveyard strategy (and the main deck Teval is also great in it)
The same things going on with Creative Energy here: I cant help but lose some excitement over an Eldrazi precon when that was the literal tagline for a precon we got less than a year ago
Its Ultra Rare rarity drives most of the premium over the set's regular cards
Boromir, Warden of the Tower Im usually not a fan of commanders that want to sacrifice themselves, but Boromir, Warden of the Tower has an important ability that automatically counters (a white counter?!) some decks' entire strategy
Longer games naturally create more opportunities to create counters, making every Proliferate trigger significantly more impactful than it would be in a faster Constructed format