Hearthpwn

Secret mage is the only viable competitive deck for mages this season that has relative success. I myself was unlucky enough to open no mage epics or legendaries this haul, and have since crafted Aluneth and still don't have the epics. Aluneth adds to secret mage's reliability and helps it with the turns it used to run out of steam and enter topdecking mode. It allows you to play more aggressive knowing that your hand refill is on the way (save the games where Aluneth is at the bottom of your deck which happens every now and then). There is a chance that as things are ironed out more mage decks will rise (and I really do hope they do), but for now Aluneth and secret mage are your best bet. If you're more into fun/theorycrafting, the epics could be more worth your while. You could possibly find something that works before the majority.

I will add I did also craft Spiteful Summoner but mostly because the "Big Spell" decks are around in multiple classes and I had to scratch my theorycrafting itch. Some days I feel like I should have crafted other missing epics like Twilight Acolyte or Voidlords that I'm missing, but other days it's fun, especially in my current "all rng casino mage" deck.

For crafting priority I'd recommend: Aluneth, Spiteful Summoner, Dragon's Fury, Meteor (kinda out of favor right now as control/fatigue mage is mostly mia from the meta), Dragoncaller Alanna (unreliable right now with control warlock with twisting nether and voidlord army dominating the meta, fun but by the time you pull it off the game is mostly over).

Good luck and happy crafting!