That's an important nuke to have in case our primary strategy of beating face with creatures doesn't pan out
Luckily, you'll often only be casting spells on your turn to begin with (minus interaction like counterspells)
With thousands of legendary creatures to build 100-card singleton decks around (give or take a few for Companions, Backgrounds, and/or Partners), there's truly no limit to how many options players have to express themselves through commander deckbuilding
Cloven Casting is at the top end of that curve
Rofellos, Llanowar Emissary is one of the best payoffs for being in mono-green
The Dihada, Binder of Wills precon has a fair amount of fluff and filler, but its easily customizable and, with this great Mardu commander at the helm, highlights exactly how a legends-matter deck tends to look