This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You cannot play more than 4 of: Aether Gust, Bonecrusher Giant // Stomp, Brazen Borrower // Petty Theft, Cauldron Familiar, Cavalier of Flame, Cavalier of Gales, Deafening Clarion, Devout Decree, Duress, Fervent Champion, Fires of Invention, Gilded Goose, Gutterbones, Legion Warboss, Lovestruck Beast // Heart's Desire, Massacre Girl, Mayhem Devil, Midnight Reaper, Murderous Rider // Swift End, Mystical Dispute, Noxious Grasp, Opt, Paradise Druid, Teferi, Time Raveler, Thrashing Brontodon, Trail of Crumbs, Vraska, Golgari Queen, Witch's Oven. · Not legal in this format: Absorb, Aether Gust, Agent of Treachery, Blacklance Paragon, Bonecrusher Giant // Stomp, Brazen Borrower // Petty Theft, Brineborn Cutthroat, Casualties of War, Cauldron Familiar, Cavalier of Flame, Cavalier of Gales, Cavalier of Night, Chandra, Acolyte of Flame, Chemister's Insight, Cindervines, Claim the Firstborn, Deafening Clarion, Devout Decree, Dovin's Veto, Drawn from Dreams, Dreadhorde Butcher, Drill Bit, Edgewall Innkeeper, Embercleave, Embereth Shieldbreaker // Battle Display, Expansion // Explosion, Fae of Wishes // Granted, Fervent Champion, Fires of Invention, Flame Sweep, Foulmire Knight // Profane Insight, Fry, Gadwick, the Wizened, Giant Killer // Chop Down, Gilded Goose, Growth Spiral, Gutterbones, Hydroid Krasis, Kenrith, the Returned King, Knight of the Ebon Legion, Korvold, Fae-Cursed King, Lava Coil, Legion Warboss, Legion's End, Leyline of the Void, Light Up the Stage, Liliana, Dreadhorde General, Lovestruck Beast // Heart's Desire, Massacre Girl, Mayhem Devil, Midnight Reaper, Mortify, Murderous Rider // Swift End, Mystical Dispute, Narset, Parter of Veils, Nightpack Ambusher, Noxious Grasp, Opt, Order of Midnight // Alter Fate, Paradise Druid, Priest of Forgotten Gods, Prison Realm, Quench, Questing Beast, Rankle, Master of Pranks, Redcap Melee, Rimrock Knight // Boulder Rush, Ritual of Soot, Rotting Regisaur, Runaway Steam-Kin, Scorch Spitter, Shifting Ceratops, Shimmer of Possibility, Sinister Sabotage, Spawn of Mayhem, Spectral Sailor, Sphinx of Foresight, Stormfist Crusader, Teferi, Time Raveler, Thought Erasure, Time Wipe, Torbran, Thane of Red Fell, Trail of Crumbs, Unsummon, Venerable Knight, Vraska, Golgari Queen, Wicked Wolf, Wildborn Preserver, Wilderness Reclamation, Witch's Oven, Yarok's Fenlurker.