This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You cannot play more than 4 of: Lovestruck Beast // Heart's Desire, Kazandu Mammoth // Kazandu Valley, Bonecrusher Giant // Stomp, Mystical Dispute, Edgewall Innkeeper, The Great Henge, Shatterskull Smashing // Shatterskull, the Hammer Pass, Negate, Heartless Act, Vivien, Monsters' Advocate, The Akroan War, Scavenging Ooze, Questing Beast, Embercleave, Brushfire Elemental, Ox of Agonas, Extinction Event, Bloodchief's Thirst, Wilt, Shark Typhoon, Omen of the Sea, Fire Prophecy, Cling to Dust, Wicked Wolf, Ugin, the Spirit Dragon, Trail of Crumbs, Thrashing Brontodon, Thieves' Guild Enforcer, Tangled Florahedron // Tangled Vale, Soaring Thought-Thief, Skyclave Shade, Mazemind Tome, Into the Story, Gilded Goose, Feasting Troll King, Essence Scatter, Elspeth's Nightmare, Duress, Drown in the Loch. · Not legal in this format: Lovestruck Beast // Heart's Desire, Kazandu Mammoth // Kazandu Valley, Bonecrusher Giant // Stomp, Mystical Dispute, Edgewall Innkeeper, The Great Henge, Shatterskull Smashing // Shatterskull, the Hammer Pass, Heartless Act, Vivien, Monsters' Advocate, The Akroan War, Scavenging Ooze, Questing Beast, Embercleave, Brushfire Elemental, Ox of Agonas, Extinction Event, Bloodchief's Thirst, Wilt, Shark Typhoon, Omen of the Sea, Fire Prophecy, Cling to Dust, Wicked Wolf, Ugin, the Spirit Dragon, Trail of Crumbs, Thieves' Guild Enforcer, Tangled Florahedron // Tangled Vale, Soaring Thought-Thief, Skyclave Shade, Mazemind Tome, Into the Story, Gilded Goose, Feasting Troll King, Elspeth's Nightmare, Drown in the Loch, Yorion, Sky Nomad, Soul Sear, Skyclave Apparition, Scorching Dragonfire, Ruin Crab, Phoenix of Ash, Genesis Ultimatum, Emeria's Call // Emeria, Shattered Skyclave, Embereth Shieldbreaker // Battle Display, Elspeth Conquers Death, Eliminate, Chainweb Aracnir, Brazen Borrower // Petty Theft, Beanstalk Giant // Fertile Footsteps, Agadeem's Awakening // Agadeem, the Undercrypt, Witch's Oven, Primal Might, Neutralize, Merfolk Windrobber, Lullmage's Domination, Jwari Disruption // Jwari Ruins, Doom Foretold, Cultivate, Treacherous Blessing, Spikefield Hazard // Spikefield Cave, Solemn Simulacrum, Shadows' Verdict, Robber of the Rich, Ram Through, Omen of the Sun, Of One Mind, Lurrus of the Dream-Den, Kogla, the Titan Ape, Klothys, God of Destiny, Garruk, Unleashed, Didn't Say Please, Ashiok, Nightmare Muse, Agonizing Remorse, Zareth San, the Trickster, Torbran, Thane of Red Fell, Rimrock Knight // Boulder Rush, Reaper of Night // Harvest Fear, Obosh, the Preypiercer, Murderous Rider // Swift End, Luminarch Aspirant, Lochmere Serpent, Llanowar Visionary, Kroxa, Titan of Death's Hunger, Ilysian Caryatid, Hagra Mauling // Hagra Broodpit, Giant Killer // Chop Down, Fervent Champion, Elder Gargaroth, Atris, Oracle of Half-Truths, Archon of Sun's Grace, Anax, Hardened in the Forge, Akoum Hellhound.