This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You must not have more than 15 cards in your sideboard. · Not legal in this format: Ajani's Presence, Akroan Skyguard, Aqueous Form, Artisan of Forms, Battlefield Thaumaturge, Battlewise Hoplite, Battlewise Valor, Blessed Alliance, Cathar's Companion, Chained to the Rocks, Cunning Breezedancer, Curious Homunculus // Voracious Reader, Dawnbringer Charioteers, Daxos of Meletis, Defiant Strike, Docent of Perfection // Final Iteration, Elite Skirmisher, Elusive Spellfist, Fabled Hero, Favored Hoplite, Gleam of Authority, Gods Willing, Hero of Iroas, Hidden Strings, Imposing Sovereign, Jace's Sanctum, Jeskai Runemark, Jeskai Sage, Knight of Sursi, Leave No Trace, Myth Realized, Niblis of Frost, Ojutai Exemplars, Ordeal of Heliod, Ordeal of Thassa, Phalanx Leader, Pristine Skywise, Setessan Battle Priest, Shimmering Grotto, Soulfire Grand Master, Spellweaver Volute, Stormcaller's Boon, Swift Justice, Triton Fortune Hunter, Wavecrash Triton, Akroan Conscriptor, Akroan Crusader, Akroan Line Breaker, Akroan Phalanx, Alesha, Who Smiles at Death, Anax and Cymede, Balefire Liege, Basilica Guards, Bedlam Reveler, Belligerent Hatchling, Bloodfire Enforcers, Boros Charm, Captured by the Consulate, Cathar's Shield, Centaur Battlemaster, Chandra, Fire of Kaladesh // Chandra, Roaring Flame, Chorus of the Tides, Coordinated Assault, Dauntless Onslaught, Deflecting Palm, Dragon-Style Twins, Enlisted Wurm, Epic Experiment, Expedite, Eyes of the Watcher, Flames of the Firebrand, Flash Conscription, Fluxcharger, Gladehart Cavalry, Gridlock, Guttersnipe, Inspiring Call, Jeskai Ascendancy, Jeskai Banner, Jeskai Charm, Jeskai Student, Kiln Fiend, Labyrinth Champion, Lifecrafter's Gift, Living Lore, Madcap Skills, Melek, Izzet Paragon, Mercurial Geists, Mirrorwing Dragon, Mizzix of the Izmagnus, Mystic Monastery, Narset, Enlightened Master, Ordeal of Nylea, Ordeal of Purphoros, Phalanx Formation, Pheres-Band Thunderhoof, Rattleclaw Mystic, Reap What Is Sown, Renegade Tactics, Roast, Satyr Hoplite, Secure the Wastes, Setessan Oathsworn, Staunch-Hearted Warrior, Stone Rain, Surrak Dragonclaw, Surrakar Spellblade, Sylvan Caryatid, Tears of Valakut, Temur Battle Rage, Temur Charm, Trail of Evidence, Violent Outburst, Weaver of Lightning, Young Pyromancer, Zada, Hedron Grinder.