This deck does not appear to be legal in Standard (Season from Sep 2021).
Problems: You must not have more than 15 cards in your sideboard. · Not legal in this format: Dragon Whisperer, Dragonlord Atarka, Dragonlord's Servant, Harbinger of the Hunt, Savage Ventmaw, Thunderbreak Regent, Utvara Hellkite, Orator of Ojutai, Palace Familiar, Youthful Scholar, Sunscorch Regent, Icefall Regent, Deathbringer Regent, Dragon-Scarred Bear, Foe-Razer Regent, Scaleguard Sentinels, Arashin Sovereign, Boltwing Marauder, Cunning Breezedancer, Enduring Scalelord, Ruthless Deathfang, Swift Warkite, Dragonloft Idol, Necromaster Dragon, Dragonlord Silumgar, Pristine Skywise, Dragonlord Ojutai, Dragonlord Kolaghan, Dragonlord Dromoka, Haven of the Spirit Dragon, Refocus, Anticipate, Mystic Meditation, Dragonlord's Prerogative, Fate Forgotten, Sandblast, Pacifism, Resupply, Flatten, Foul-Tongue Invocation, Crux of Fate, Douse in Gloom, Fearsome Awakening, Sarkhan's Triumph, Draconic Roar, Seismic Rupture, Tail Slash, Sarkhan's Rage, Winds of Qal Sisma, Revealing Wind, Naturalize, Explosive Vegetation, Traveler's Amulet, Map the Wastes, Sarkhan the Mad, Temur Banner, Jeskai Banner, Sultai Banner, Mardu Banner, Broodmate Dragon, Frontier Bivouac, Opulent Palace, Mystic Monastery, Nomad Outpost, Mindscour Dragon, Noxious Dragon, Wardscale Dragon, Sarkhan Unbroken, Atarka's Command, Dromoka's Command, Silumgar's Command, Outpost Siege, Coiling Oracle, Monastery Siege, Whisperer of the Wilds, Aven Skirmisher, Kolaghan's Command, Palace Siege, Dragon Tempest, Tormenting Voice, Roast, Bathe in Dragonfire, Frontier Siege, Citadel Siege.