Id also keep a close eye on Sea Gate Loremaster and General Tazi, which are in similar positions
The best turns involve copying this legendary artifact with Echo Storm or a similar effect, though you'll have to get rid of any copies that still remain, since Ugin's Nexus would make you skip over all your hard-earned turns if you keep a copy in play
Lightning Bolt is reasonably close to Fatal Push in power level, helping to clean up early creatures so you can get your game on, and Cleansing Wildfire is a fine card, but mostly being played as enabler
During the presentation, Kiritz mentioned an alternative multiplayer-focused Arena client may be needed

Aang and La, Ocean's Fury Abuelo, Ancestral Echo Agrus Kos, Spirit of Justice Anafenza, Unyielding Lineage Benevolent River Spirit Betor, Kin to All Billowing Shriekmass Bloodghast Bogwater Lumaret Charging Strifeknight Chupacabra Echo Cold Case Cracker Council of Echoes Deepfathom Echo Defenestrated Phantom Didact Echo Drogskol Reaver Dust Animus East Wind Avatar Echo of Dusk Empyrean Eagle Erratic Apparition Exdeath, Void Warlock Friendly Ghost Frog Butler Furious Forebear Ghostly Dancers Ghostly Keybearer Glitch Ghost Surveyor Harvester of Misery Hei Bai, Spirit of Balance Infernal Phantom Intruding Soulrager Knowledge Seeker Koh, the Face Stealer Marketwatch Phantom Moonshaker Cavalry Myojin of Night's Reach Neo Exdeath, Dimension's End Neriv, Heart of the Storm North Wind Avatar Rampaging Soulrager Screaming Phantom Seymour Flux Shepherding Spirits Shiko, Paragon of the Way Shrouded Shepherd Souls of the Lost South Wind Avatar Spectral Sailor Spectral Snatcher Spinner of Souls Spirit Mascot Starving Revenant Stone Docent Summoned Dromedary Teval, Arbiter of Virtue The Ancient One The Grim Captain Tragic Banshee Unrooted Ancestor Ureni, the Song Unending Wan Shi Tong, Librarian West Wind Avatar Yue, the Moon Spirit
