This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: Not legal in this format: Hissing Quagmire, Lumbering Falls, Needle Spires, Shambling Vent, Wandering Fumarole, Aerial Volley, Elvish Mystic, Gorgon's Head, Mist-Cloaked Herald, Outflank, Spontaneous Mutation, Thraben Inspector, Titan's Strength, Unwilling Ingredient, Altar's Reap, Avacyn's Judgment, Combine Guildmage, Conclave Mentor, Coralhelm Guide, Earthen Arms, Elderfang Disciple, Elvish Visionary, Ensoul Artifact, Evolutionary Leap, Field Creeper, Grasp of the Hieromancer, Infernal Scarring, Jace's Scrutiny, Just the Wind, Key to the City, Macabre Waltz, Mighty Leap, Murderous Compulsion, Nessian Hornbeetle, Ondu Rising, Pathmaker Initiate, Rabid Bite, Ravaging Blaze, Shadows of the Past, Sigil of Valor, Sigiled Skink, Smash to Smithereens, Sungrace Pegasus, True-Faith Censer, Wrangle, Angel's Tomb, Angelic Sleuth, Artificer's Epiphany, Blood-Cursed Knight, Butcher's Cleaver, Calculated Dismissal, Deadbridge Shaman, Deeproot Waters, Displace, Emry, Lurker of the Loch, Expose to Daylight, Eyeblight Assassin, Fiery Temper, Furious Rise, Gideon of the Trials, Hydra's Growth, Iroas's Champion, Jungleborn Pioneer, Make Mischief, Mayhem Devil, Nantuko Husk, Nissa's Pilgrimage, Onakke Ogre, Quicksmith Genius, Read the Bones, Root Out, Scatter to the Winds, Seer of the Last Tomorrow, Shaman of the Pack, Sheer Drop, Skyscanner, Survive the Night, Teyo's Lightshield, Tomebound Lich, Uncaged Fury, Village Bell-Ringer, Watertrap Weaver, Witch's Vengeance, Aspiring Aeronaut, Blightcaster, Bone to Ash, Dance with Devils, Dwynen, Gilt-Leaf Daen, Electrify, Enthralling Victor, Eyeblight Massacre, Forerunner of the Heralds, Goreclaw, Terror of Qal Sisma, Hell Mongrel, Hulking Devil, Hunter's Edge, Inspiring Roar, Kitchen Imp, Llanowar Empath, Quicksmith Rebel, Reclusive Artificer, Sarkhan's Unsealing, Seafloor Oracle, Suppression Bonds, Tempest Caller, Thopter Spy Network, Thunderclap Wyvern, Weight of the Underworld, Zendikar Incarnate, Experimental Aviator, Faithbearer Paladin, Gilt-Leaf Winnower, Goblin Dark-Dwellers, Knightly Valor, Necromantic Summons, Ob Nixilis Reignited, Priest of the Blood Rite, Psychosis Crawler, Rhox Oracle, Salvager of Secrets, Sigil of the Empty Throne, Steppe Glider, Tragic Arrogance, Unholy Hunger, Watcher in the Web, Zendikar's Roil, Biogenic Upgrade, Deep-Sea Terror, Devils' Playground, Kapsho Kitefins, Primordial Wurm, Urbis Protector, Gaea's Revenge, Gideon's Phalanx, Mage-Ring Responder, Nissa's Revelation, Seraph of the Suns.