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, Shatterskull Smashing // Shatterskull, the Hammer Pass, Bloodchief's Thirst, Scavenging Ooze, Mystical Dispute, Lovestruck Beast // Heart's Desire, Kazandu Mammoth // Kazandu Valley, Heartless Act, Edgewall Innkeeper, Scorching Dragonfire, Negate, Embercleave, Vivien, Monsters' Advocate, The Great Henge, Skyclave Apparition, Shark Typhoon, Ox of Agonas, Glass Casket, Elspeth Conquers Death, Cling to Dust, Brushfire Elemental, Yorion, Sky Nomad, Thieves' Guild Enforcer, Soaring Thought-Thief, Questing Beast, Mazemind Tome, Into the Story, Extinction Event, Drown in the Loch, Chainweb Aracnir, Agadeem's Awakening // Agadeem, the Undercrypt, Shatter the Sky, Omen of the Sea, Emeria's Call // Emeria, Shattered Skyclave, Duress, Agonizing Remorse. · Not legal in this format: Bonecrusher Giant // Stomp, Shatterskull Smashing // Shatterskull, the Hammer Pass, Bloodchief's Thirst, Scavenging Ooze, Mystical Dispute, Lovestruck Beast // Heart's Desire, Kazandu Mammoth // Kazandu Valley, Heartless Act, Edgewall Innkeeper, Scorching Dragonfire, Embercleave, Vivien, Monsters' Advocate, The Great Henge, Skyclave Apparition, Shark Typhoon, Ox of Agonas, Elspeth Conquers Death, Cling to Dust, Brushfire Elemental, Yorion, Sky Nomad, Thieves' Guild Enforcer, Soaring Thought-Thief, Questing Beast, Mazemind Tome, Into the Story, Extinction Event, Drown in the Loch, Chainweb Aracnir, Agadeem's Awakening // Agadeem, the Undercrypt, Shatter the Sky, Omen of the Sea, Emeria's Call // Emeria, Shattered Skyclave, Agonizing Remorse, The Birth of Meletis, Skyclave Shade, Ruin Crab, Primal Might, Phoenix of Ash, Omen of the Sun, Murderous Rider // Swift End, Mire Triton, Merfolk Windrobber, Lullmage's Domination, Llanowar Visionary, Kroxa, Titan of Death's Hunger, Hagra Mauling // Hagra Broodpit, Gilded Goose, Eliminate, Wicked Wolf, Ugin, the Spirit Dragon, Tymaret Calls the Dead, Trail of Crumbs, The Akroan War, Stonecoil Serpent, Spikefield Hazard // Spikefield Cave, Solemn Simulacrum, Robber of the Rich, Rimrock Knight // Boulder Rush, Lotus Cobra, Klothys, God of Destiny, Gemrazer, Garruk's Harbinger, Elspeth's Nightmare, Elder Gargaroth, Doom Foretold, Charming Prince, Brazen Borrower // Petty Theft, Wilt, Turntimber Symbiosis // Turntimber, Serpentine Wood, Treacherous Blessing, Tangled Florahedron // Tangled Vale, Shredded Sails, Redcap Melee, Rankle, Master of Pranks, Nighthawk Scavenger, Neutralize, Lurrus of the Dream-Den, Giant Killer // Chop Down, Foulmire Knight // Profane Insight, Fervent Champion, Embereth Shieldbreaker // Battle Display, Dream Trawler, Beanstalk Giant // Fertile Footsteps, Anax, Hardened in the Forge, Torbran, Thane of Red Fell, Sea Gate Restoration // Sea Gate, Reborn, Polukranos, Unchained, Liliana, Waker of the Dead, Jwari Disruption // Jwari Ruins, Heliod's Intervention, Glasspool Mimic // Glasspool Shore, Garruk, Unleashed, Call of the Death-Dweller.