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, Brineborn Cutthroat, Casualties of War, Cauldron Familiar, Chemister's Insight, Deafening Clarion, Duress, Edgewall Innkeeper, Gadwick, the Wizened, Gilded Goose, Gutterbones, Lovestruck Beast // Heart's Desire, Massacre Girl, Mayhem Devil, Midnight Reaper, Murderous Rider // Swift End, Mystical Dispute, Noxious Grasp, Opt, Paradise Druid, Priest of Forgotten Gods, Questing Beast, Shock, Sorcerous Spyglass, Teferi, Time Raveler, Thrashing Brontodon, Trail of Crumbs, Wicked Wolf, Witch's Oven. · Not legal in this format: Absorb, Aether Gust, Agent of Treachery, Angrath's Rampage, Beanstalk Giant // Fertile Footsteps, 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, Deathless Knight, Devout Decree, Domri's Ambush, Doom Foretold, Dovin's Veto, Dreadhorde Butcher, Drill Bit, Edgewall Innkeeper, Embercleave, Embereth Shieldbreaker // Battle Display, Experimental Frenzy, Fae of Wishes // Granted, Fervent Champion, Fires of Invention, Flame Sweep, Footlight Fiend, Foulmire Knight // Profane Insight, Frilled Mystic, Gadwick, the Wizened, Giant Killer // Chop Down, Gilded Goose, Golden Egg, Growth Spiral, Growth-Chamber Guardian, Gruul Spellbreaker, Gutterbones, Hydroid Krasis, Ionize, Kenrith, the Returned King, Knight of Autumn, Korvold, Fae-Cursed King, Kraul Harpooner, Lava Coil, Legion Warboss, Legion's End, Leyline of the Void, Light Up the Stage, Liliana, Dreadhorde General, Lovestruck Beast // Heart's Desire, Lucky Clover, Massacre Girl, Mayhem Devil, Midnight Reaper, Murderous Rider // Swift End, Mystical Dispute, Nightpack Ambusher, Nissa, Who Shakes the World, Noxious Grasp, Oath of Kaya, Opt, Order of Midnight // Alter Fate, Paradise Druid, Pelt Collector, Priest of Forgotten Gods, Prison Realm, Quench, Questing Beast, Rankle, Master of Pranks, Rimrock Knight // Boulder Rush, Ritual of Soot, Rotting Regisaur, Scorching Dragonfire, Shifting Ceratops, Sinister Sabotage, Skarrgan Hellkite, Sphinx of Foresight, Teferi, Time Raveler, Time Wipe, Trail of Crumbs, Vraska, Golgari Queen, Wicked Wolf, Witch's Oven, Zhur-Taa Goblin.