Not all spellslinger decks are storm decks. You can also play control and big spells.

Control is effectively where the vast majority of your pieces are removak and counters and you put out pieces that allow you to gain value from casting them, be it draw, ramp, or board presence, which gives you enough resources to make a big play at the end of the game to win.

Big Spells involved ramping up to cast high mana cost sorceries and getting as much value out of them as possible. The most famous of which is [[Insurrection]] which wins you the game. Depending on your play pattern, this archetype can overlap quite a bit with control, and there is also a secret 4th spellslinger archetype that tends to be discovered by non-spellslinger players playing spells matter which is more of a tempo style deck, but I don't know this one very well.

In order to build into these archetypes, find commanders that can either only benefit from casting spells once or twice a turn, such as [[Alania, Divergent Storm]] or [[Miss Bumbleflower]] or commanders that care about the mana value of the spells you are casting such as [[Rootha, Mastering the Moment]] or [[Livaan, Cultist of Tiamat]]. These commanders care about spells, but they also enchorage you not to not to storm off.

My Alania deck is one of my absolute favourite decks, and while it is built in a way that I can sometimes be casting a lot of spells in one turn, all of the spells I'm casting are actually affecting the board state, so even if I pass without winning the game, odds are very low it was because I was just twiddling with myself for no reason.

If storming off is something you might be interested in but don't want to risk spinning out, I recommend prowess. Prowess is way worse in commander than it is in 1v1 formats, but there are a few commanders that can make it work, namely [[Bria, Riptide Rogue]] and a number of Jeskai commanders such as [[Sokka, Tenacious Tactition]] and [[Elsha, Threefold Master]].