Spellslinger always sounds like more fun than it is. Conceptually I imagine being a badass wizard, with a host of unique and powerful spells that keep my opponents constantly guessing. In reality, it tends to be more "...and I'll cast my eighth cantrip, then flash it back, storm count is 12, everyone take 4 from guttersnipe, then I'll cast another high tide and copy it..." while the rest of the table has fallen asleep several hours ago.
So this is less of a coherent strategy and more of a theme deck. The goal is to build a spellslinger deck that does, y'know, cool and interesting things instead of boring and repetitive things. As such, it's built more about "how interesting and fun is this card?" instead of "how does this card fit into our plan?" This deck doesn't really have a plan, except to cast a bunch of cool spells and try to figure out a way to win. Mostly by using whatever our opponents are doing to our advantage.
Commander is somewhat replaceable, but
Rootha, Mercurial Artist is my current pick. She's got the requisite colors, she does a spellslinger thing, she's interesting, and she's not terribly broken. But there are definitely plenty of other options that could fit into the deck instead.
1 Rootha, Mercurial Artist
1 Immolating Gyre
1 Volcanic Vision
1 Spelltwine
1 Refuse // Cooperate
1 Galvanic Iteration
1 Geistblast
1 Twincast
1 Narset's Reversal
1 Increasing Vengeance
1 Radiate
1 Repeated Reverberation
1 Reiterate
1 Fork
1 Reverberate
1 Deflecting Swat
1 Misdirection
1 Wild Ricochet
1 Swerve
1 Incite Rebellion
1 Cerebral Vortex
1 Reckless Endeavor
1 Magma Opus
1 Mercadia's Downfall
1 Disrupt Decorum
1 Insurrection
1 Heat Shimmer
1 Hate Mirage
1 Wrong Turn
1 Elminster's Simulacrum
1 Reins of Power
1 Domineering Will
1 Bribery
1 Supplant Form
1 Word of Seizing
1 Fiery Confluence
1 Clash of Titans
1 Divergent Transformations
1 Chaos Warp
1 Volcanic Offering
1 Wild Magic Surge
1 Impact Resonance
1 Arcbond
1 Commandeer
1 Gale's Redirection
1 Aethersnatch
1 Pyromancer's Goggles
1 Primal Amulet
1 Twinning Staff
1 Rings of Brighthearth
1 Chaos Wand
1 Wand of Wonder*
1 Rowan, Scholar of Sparks
1 Jaya Ballard
1 Double Vision
1 Echo Mage
1 Gale, Waterdeep Prodigy
1 Lier, Disciple of the Drowned
1 Skyway Robber
1 Mischievous Quanar
1 Wildfire Devils
1 Radiant Performer
1 Dire Fleet Daredevil
1 Lithoform Engine
1 Rod of Absorption
1 Skyfire Phoenix
1 Mirage Mirror
//Sideboard
As you can see, I'm a bit overloaded on nonlands at the moment, so I have some more cuts to make. My biggest concern is that I'm not sure we'll have enough stuff to do if people aren't playing many instants or sorceries, so I'm wondering if I should maybe cut some of the copying effects, especially since my commander already does some of that herself, and a lot of my spells don't do much extra by being copied anyway.