This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You cannot play more than 4 of: Bonecrusher Giant // Stomp, Teferi, Time Raveler, Mystical Dispute, Aether Gust, Growth Spiral, Uro, Titan of Nature's Wrath, Redcap Melee, Robber of the Rich, Devout Decree, Witch's Oven, Mayhem Devil, Cauldron Familiar, Nissa, Who Shakes the World, Hydroid Krasis, Elspeth Conquers Death, Brazen Borrower // Petty Theft, Agonizing Remorse, Unchained Berserker, Scorching Dragonfire, Scorch Spitter, Runaway Steam-Kin, Lovestruck Beast // Heart's Desire, Light Up the Stage, Fervent Champion, Embereth Shieldbreaker // Battle Display, Embercleave, Anax, Hardened in the Forge, Woe Strider, Sphinx of Foresight, Shatter the Sky, Priest of Forgotten Gods, Legion Warboss, Fires of Invention, Deafening Clarion, Claim the Firstborn, Cavalier of Flame. · Not legal in this format: Bonecrusher Giant // Stomp, Teferi, Time Raveler, Mystical Dispute, Aether Gust, Growth Spiral, Uro, Titan of Nature's Wrath, Redcap Melee, Robber of the Rich, Devout Decree, Witch's Oven, Mayhem Devil, Cauldron Familiar, Nissa, Who Shakes the World, Hydroid Krasis, Elspeth Conquers Death, Brazen Borrower // Petty Theft, Agonizing Remorse, Unchained Berserker, Scorching Dragonfire, Scorch Spitter, Runaway Steam-Kin, Lovestruck Beast // Heart's Desire, Light Up the Stage, Fervent Champion, Embereth Shieldbreaker // Battle Display, Embercleave, Anax, Hardened in the Forge, Woe Strider, Sphinx of Foresight, Shatter the Sky, Priest of Forgotten Gods, Legion Warboss, Fires of Invention, Deafening Clarion, Claim the Firstborn, Cavalier of Flame, Wilderness Reclamation, Torbran, Thane of Red Fell, Thought Erasure, Storm's Wrath, Opt, Midnight Reaper, Lucky Clover, Kenrith, the Returned King, Expansion // Explosion, Edgewall Innkeeper, Dovin's Veto, Casualties of War, Trail of Crumbs, Tibalt, Rakish Instigator, Tamiyo, Collector of Tales, Lava Coil, Kroxa, Titan of Death's Hunger, Heliod's Intervention, Gilded Goose, Fae of Wishes // Granted, Dream Trawler, Dreadhorde Butcher, Beanstalk Giant // Fertile Footsteps, Tyrant's Scorn, Thassa's Intervention, Rimrock Knight // Boulder Rush, Questing Beast, Omen of the Sea, Noxious Grasp, Narset, Parter of Veils, Mire Triton, Massacre Girl, Korvold, Fae-Cursed King, Knight of Autumn, Gutterbones, Escape to the Wilds, Epic Downfall, Chemister's Insight, Chandra, Acolyte of Flame, Cavalier of Gales, Agent of Treachery, Absorb, Tymaret Calls the Dead, Tithe Taker, The Birth of Meletis, Thassa, Deep-Dwelling, Rankle, Master of Pranks, Pharika's Libation, Nightpack Ambusher, Murderous Rider // Swift End, Merfolk Secretkeeper // Venture Deeper, Fblthp, the Lost, Elite Guardmage, Deputy of Detention, Charming Prince, Chandra's Pyrohelix, Arboreal Grazer, Act of Treason.