Much like everyone else I thoroughly dislike the aesthethic, but I'm a big fan of some of the card designs
Certain:
Hobgoblin, Mantled Marauder: Easy include for my cube with such heavy discard themes. Marauding Mako has been a stud.
Agent Venom: I'd cut Midnight Repear for being a little...
One of my favorite cube archetypes is Azorius Flash. It’s a dynamic tempo deck backed with counterspells and removal. The available card pool allows the archetype to scale to almost any power level imo
And inevitably there will be another card printed within a year or so that will fulfill a similar enough role, with better aesthetics, and is good enough to replace the eye-sores. I think of a handful of cards as stand-ins until the perfect card comes along…it allows me to hone in my cube’s design
Might be worth considering:
Threefold Thunderhulk
If I went with a lower power reanimation package, I'd definitely be testing it. It's a step above those 3 in power, but still below Myr Battlesphere
Have you considered Voice of Victory? I'm grappling on whether I want to introduce mobilize in my environment or not, but it's a very cool card and it would be good with Haliya.
Glancing at your list....maybe one of:
Flagstones of Trokair
Haliya Guided by Light
Timeless Dragon
I don't know if Flagstones really pulls its weight. It's a fun +2% juice type of card, but in comparison Aspirant is a p1p1 level card with loads of utility and draws someone to draft white...
Rishkar, Peema Renegade
is pretty fun with the constructs. Buffs them and also gives you more mana to dump into them.
Scout for Survivors
Live the dream returning two of Walking Ballista, Hangarback Walker, Marketback Walker and Rishkar!
Emry, Lurker of the Loch
Chromehost Seedshark
Tinker
Emry is easily my favorite blue artifact support card (maybe my favorite card in my cube!). I like Seedshark's function, but incubate X is just so obnoxious. Fair Tinker is a very fun card imo.
Honorable Mention:
Forensic Gadgeteer
I...