You get Coveted Prize as a spicy tutor, Spoils of Adventure as great card draw, and Practiced Tactics for cheap removal
That fragility is an important part of my endorsement of the card here
During combat, it gives another target elemental myriad, meaning that whenever it attacks, it creates a token copy that's tapped and attacking each other opponent
we were introduced to some new Amonkhet gods with Sab-Sunen, Luxa Embodied and Ketramose, the New Dawn, we picked up a new cycle of 2-color Gearhulks and a batch of underwhelming-but-funny vanilla legendaries, and I'd say the experimentation with The Aetherspark went over well enough, as one of the most unique card designs this year
Aether Refinery will often just be a six-mana artifact that produces two energy per turn, which isn't great value

Annihilating Fire Artillerize Beacon of Destruction Blast from the Past Bottle-Cap Blast Brimstone Volley Burst Lightning Cackling Flames Calibrated Blast Call In a Professional Carbonize Chain of Plasma Char Collateral Damage Comet Storm Dance with Devils Deal Damage Death Spark Dogpile Eelectrocute Electrodominance Ember Shot Explosive Impact Explosive Welcome Fateful End Fateful Showdown Fiery Temper Fireblast Fires of Undeath Flame Burst Flame Javelin Flame Lash Flare Flick a Coin Fling Galvanic Blast Geistblast Geistflame Ghostfire Slice Glacial Ray Grab the Reins Guerrilla Tactics Gut Shot Hanabi Blast Heartfire Improvised Club Incinerate Inescapable Blaze Ire of Kaminari Kazuul's Fury Kindle Last-Ditch Effort Lava Dart Lightning Blast Lightning Bolt Lightning Storm Lightning Strike Lightning Volley Magma Burst Magma Jet Massive Raid Moonrager's Slash Needle Drop Open Fire Orcish Cannonade Parch Play with Fire Provoke the Trolls Puncture Blast Punishing Fire Pyromatics