This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You cannot play more than 4 of: Aether Gust, Beanstalk Giant // Fertile Footsteps, Bonecrusher Giant // Stomp, Brazen Borrower // Petty Theft, Casualties of War, Cauldron Familiar, Cavalier of Flame, Deafening Clarion, Duress, Edgewall Innkeeper, Embercleave, Embereth Shieldbreaker // Battle Display, Fires of Invention, Frilled Mystic, Gilded Goose, Growth Spiral, Hydroid Krasis, Korvold, Fae-Cursed King, Lovestruck Beast // Heart's Desire, Mayhem Devil, Murderous Rider // Swift End, Mystical Dispute, Nightpack Ambusher, Nissa, Who Shakes the World, Noxious Grasp, Paradise Druid, Quench, Shifting Ceratops, Sphinx of Foresight, Teferi, Time Raveler, Thrashing Brontodon, Tithe Taker, Trail of Crumbs, Witch's Oven. · Not legal in this format: Absorb, Aether Gust, Angrath's Rampage, Arboreal Grazer, Beanstalk Giant // Fertile Footsteps, Blacklance Paragon, Bonecrusher Giant // Stomp, Brazen Borrower // Petty Theft, Brineborn Cutthroat, Casualties of War, Cauldron Familiar, Cavalier of Flame, Cavalier of Gales, Cavalier of Thorns, Chandra, Acolyte of Flame, Chemister's Insight, Claim the Firstborn, Deafening Clarion, Devout Decree, Dovin's Veto, Drill Bit, Edgewall Innkeeper, Embercleave, Embereth Shieldbreaker // Battle Display, Epic Downfall, Fae of Wishes // Granted, Fervent Champion, Finale of Devastation, Fires of Invention, Flame Sweep, Foulmire Knight // Profane Insight, Frilled Mystic, Fry, Gadwick, the Wizened, Giant Killer // Chop Down, Gilded Goose, Growth Spiral, Gruul Spellbreaker, Gutterbones, Hydroid Krasis, Ionize, Justice Strike, Kenrith, the Returned King, Knight of the Ebon Legion, Korvold, Fae-Cursed King, Lava Coil, Leafkin Druid, Legion Warboss, Legion's End, Light Up the Stage, 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, Opt, Order of Midnight // Alter Fate, Paradise Druid, Pelt Collector, Priest of Forgotten Gods, Quasiduplicate, Quench, Questing Beast, Ral's Outburst, Rankle, Master of Pranks, Rimrock Knight // Boulder Rush, Risen Reef, Rotting Regisaur, Scorch Spitter, Scorching Dragonfire, Shifting Ceratops, Shimmer of Possibility, Sinister Sabotage, Spawn of Mayhem, Sphinx of Foresight, Stormfist Crusader, Teferi, Time Raveler, The Great Henge, Thought Erasure, Time Wipe, Tithe Taker, Trail of Crumbs, Unbreakable Formation, Vivien, Arkbow Ranger, Vraska, Golgari Queen, Wicked Wolf, Witch's Oven.