The nightmare is turn 1 lotus, Sac lotus, cast commander, turn 2 sol ring, holding up 3 for OP agent
Abbot of Keral Keep Agent of Atlas Aligned Heart Bearer of Overwhelming Truths Bedlam Reveler Bloodfire Expert Bloodwater Entity Bria, Riptide Rogue Cori-Steel Cutter Crescent Island Temple Crimson Operative Cursed Firebreathing Yogurt Cyclops Superconductor Disciples of the Inferno Dragon Bell Monk Dragon-Style Twins Drake Hatcher Dwarven Forge-Chanter Ecstatic Electromancer Elemental Eruption Elementalist Adept Elsha of the Infinite Elsha, Threefold Master Elusive Otter Elusive Otter Emberheart Challenger Eris, Roar of the Storm Firebending Student Frenzied Geistblaster Fugitive Codebreaker Gitaxian Spellstalker Goblin Wizardry Harmonic Prodigy Heartfire Immolator Iguana Parrot Ingenious Skaab Iron Fist, Hero for Hire Jaya, Fiery Negotiator Jeskai Brushmaster Jeskai Elder Jeskai Revelation Jeskai Sage Jeskai Student Jeskai Windscout Jhessian Thief Khenra Spellspear Kitsa, Otterball Elite Kree Commandos Lightning Visionary Lightshell Duo Lilah, Undefeated Slickshot Lotus Path Djinn Lotus-Eye Mystics Lyse Hext Mage-Ring Bully Mai, Jaded Edge Master Pakku Meticulous Artisan Mistfire Adept Mistral Singer Molten Lavamancer Monastery Mentor Monastery Swiftspear Monica Rambeau Narset, Enlightened Exile Niblis of Dusk Niblis of Frost Nimble-Blade Khenra Otterball Antics Patriot, Young Avenger Pearl Lake Ancient Photon, Living Light
If a Song-focused Amber/Steel deck is more your speed, there are some possible additions here as well
And why not
Taking a random one-drop wont stop them from casting two more, and they have enough game-winners that discarding those is rough even when the spent mana doesnt just mean you lose to 1/1 beatdown
What Happened to The Scarab God
