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, Mystical Dispute, Heartless Act, Omen of the Sea, Binding the Old Gods, Alrund's Epiphany, Wolfwillow Haven, Redcap Melee, Ox of Agonas, Negate, Lovestruck Beast // Heart's Desire, Eliminate, Duress, Shadows' Verdict, Goldspan Dragon, Frost Bite, Emergent Ultimatum, Elder Gargaroth, Edgewall Innkeeper, Disdainful Stroke, Cultivate, The Akroan War, Extinction Event, Embercleave, Brazen Borrower // Petty Theft, Test of Talents, Saw It Coming, Roiling Vortex, Giant Killer // Chop Down, Elspeth's Nightmare, Elite Spellbinder. · Not legal in this format: Bonecrusher Giant // Stomp, Mystical Dispute, Heartless Act, Omen of the Sea, Binding the Old Gods, Alrund's Epiphany, Wolfwillow Haven, Redcap Melee, Ox of Agonas, Lovestruck Beast // Heart's Desire, Eliminate, Shadows' Verdict, Goldspan Dragon, Frost Bite, Emergent Ultimatum, Elder Gargaroth, Edgewall Innkeeper, Cultivate, The Akroan War, Extinction Event, Embercleave, Brazen Borrower // Petty Theft, Test of Talents, Saw It Coming, Roiling Vortex, Giant Killer // Chop Down, Elspeth's Nightmare, Elite Spellbinder, Shark Typhoon, Sea Gate Restoration // Sea Gate, Reborn, Scorching Dragonfire, Robber of the Rich, Rimrock Knight // Boulder Rush, Polukranos, Unchained, Mazemind Tome, Koma, Cosmos Serpent, Jwari Disruption // Jwari Ruins, Jaspera Sentinel, Fervent Champion, Anax, Hardened in the Forge, Yorion, Sky Nomad, Torbran, Thane of Red Fell, Thieves' Guild Enforcer, Soul Sear, Soaring Thought-Thief, Skyclave Apparition, Showdown of the Skalds, Shatterskull Smashing // Shatterskull, the Hammer Pass, Selfless Savior, Ruin Crab, Reidane, God of the Worthy // Valkmira, Protector's Shield, Phoenix of Ash, Merfolk Windrobber, Klothys, God of Destiny, Kazandu Mammoth // Kazandu Valley, Into the Story, Fireblade Charger, Expressive Iteration, Drown in the Loch, Drannith Magistrate, Cling to Dust, Vorinclex, Monstrous Raider, Valki, God of Lies // Tibalt, Cosmic Impostor, Valiant Rescuer, The Great Henge, Skyclave Shade, Quandrix Cultivator, Professor Onyx, Prismari Command, Pelakka Predation // Pelakka Caverns, Lurrus of the Dream-Den, Luminarch Aspirant, Kroxa, Titan of Death's Hunger, Kiora Bests the Sea God, Kaervek, the Spiteful, Irencrag Pyromancer, Hall Monitor, Galazeth Prismari, Flourishing Fox, Fire Prophecy, Esika's Chariot, Drannith Stinger, Crippling Fear, Clarion Spirit, Alseid of Life's Bounty, Agadeem's Awakening // Agadeem, the Undercrypt, Toski, Bearer of Secrets, Shadowspear, Scavenging Ooze, Rip Apart, Questing Beast, Of One Mind, Jegantha, the Wellspring, Go Blank, Cinderclasm.