You don't have to run them in dedicated discard decks, they have value on their own
To help jumpstart this deck, I consulted the average list of another Izzet commander that likes big spells: Zaffai, Thunder ConductorZaffai, Thunder Conductor: Average Zaffai View on Archidekt Commander (1) 1 Zaffai, Thunder ConductorZaffai, Thunder Conductor Sorceries (20) 1 Aether GaleAether Gale 1 Apex of PowerApex of Power 1 Blasphemous ActBlasphemous Act 1 Brass's BountyBrass's Bounty 1 Creative TechniqueCreative Technique 1 Epic ExperimentEpic Experiment 1 Explosive SingularityExplosive Singularity 1 Expressive IterationExpressive Iteration 1 Faithless LootingFaithless Looting 1 Inspiring RefrainInspiring Refrain 1 Mana GeyserMana Geyser 1 Mind's DesireMind's Desire 1 Mizzix's MasteryMizzix's Mastery 1 Muse VortexMuse Vortex 1 PonderPonder 1 Rousing RefrainRousing Refrain 1 Serum VisionsSerum Visions 1 Surge to VictorySurge to Victory 1 Treasure CruiseTreasure Cruise 1 Volcanic VisionVolcanic Vision Instants (15) 1 AetherspoutsAetherspouts 1 BrainstormBrainstorm 1 Chaos WarpChaos Warp 1 Comet StormComet Storm 1 CounterspellCounterspell 1 Dig Through TimeDig Through Time 1 ElectrodominanceElectrodominance 1 Expansion // ExplosionExpansion // Explosion 1 Frantic SearchFrantic Search 1 Galvanic IterationGalvanic Iteration 1 Mystic ConfluenceMystic Confluence 1 Narset's ReversalNarset's Reversal 1 ReinterpretReinterpret 1 ResculptResculpt 1 Seething SongSeething Song Artifacts (9) 1 Arcane SignetArcane Signet 1 Elementalist's PaletteElementalist's Palette 1 Hedron ArchiveHedron Archive 1 Izzet SignetIzzet Signet 1 Mind StoneMind Stone 1 Mindsplice ApparatusMindsplice Apparatus 1 Pyromancer's GogglesPyromancer's Goggles 1 Sol RingSol Ring 1 Talisman of CreativityTalisman of Creativity Creatures (14) 1 Archmage EmeritusArchmage Emeritus 1 Dazzling SphinxDazzling Sphinx 1 Diluvian PrimordialDiluvian Primordial 1 Dualcaster MageDualcaster Mage 1 Etali, Primal StormEtali, Primal Storm 1 Goblin ElectromancerGoblin Electromancer 1 Harmonic ProdigyHarmonic Prodigy 1 Rionya, Fire DancerRionya, Fire Dancer 1 Rootha, Mercurial ArtistRootha, Mercurial Artist 1 Storm-Kiln ArtistStorm-Kiln Artist 1 Stormcatch MentorStormcatch Mentor 1 Talrand, Sky SummonerTalrand, Sky Summoner 1 Veyran, Voice of DualityVeyran, Voice of Duality 1 Wildfire DevilsWildfire Devils Enchantments (4) 1 Double VisionDouble Vision 1 Metallurgic SummoningsMetallurgic Summonings 1 Sunbird's InvocationSunbird's Invocation 1 Swarm IntelligenceSwarm Intelligence Planeswalkers (1) 1 Jaya BallardJaya Ballard Lands (36) 1 Cascade BluffsCascade Bluffs 1 Command TowerCommand Tower 1 Exotic OrchardExotic Orchard 1 Forgotten CaveForgotten Cave 1 Frostboil SnarlFrostboil Snarl 9 IslandIsland 1 Izzet BoilerworksIzzet Boilerworks 1 Lonely SandbarLonely Sandbar 1 Mage-Ring NetworkMage-Ring Network 9 MountainMountain 1 Myriad LandscapeMyriad Landscape 1 Mystic SanctuaryMystic Sanctuary 1 Prismari CampusPrismari Campus 1 Reliquary TowerReliquary Tower 1 Scavenger GroundsScavenger Grounds 1 Shivan ReefShivan Reef 1 Steam VentsSteam Vents 1 Sulfur FallsSulfur Falls 1 Temple of EpiphanyTemple of Epiphany 1 Temple of the False GodTemple of the False God ZaffaiZaffai is very similar to TellahTellah, caring about instants and sorceries at MV 1, 5, and 10 as opposed to noncreature spells at 1, 4, and 8
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Its probably okay at seven, but might still be pretty scary
However, $4 feels about right since she wont be good in every deck with access to Green and White
