EMP: I personally hate this card, but I would rather see it get a star reduction than a mana boost, so that it could serve as a decent tech card. Plus, it’s probably the only playable and reactive lategame threat. 7 mana, 7/7 or 6/6 is enough for me.
Thunderhorn: pretty fair nerf that most people would agree on. Personally, I would make it a faction card in any faction but Vet and Vanar.
Lost in the desert: fair nerf, but I would rather rework its effect to be more punishing to minions and less so to generals. Maybe: 4 mana, “Transform enemy minions not nearby enemies into friendly dervishes”
Blood of Air/ Siphon energy: right now, Vet has a lot of good but expensive removal. It all comes down to personal vision of Vet’s faction identity, but I kinda like to have a faction who relies on expensive removal.
Mind Cage Oni: Personally, I have no problem with this dude, but other people might. It could be cool to give it a star boost and make the effect symmetrical.
Tusk Boar: potatoe potahto, I can’t really judge this one. Cards with recursive effects (looking at you desolator) are noutoriously difficult to judge.
Zendo: As much as I like the card, I have to agree that GMZ is a bit on the strong side. Keep in mind, however, that it is the only proactive Songhai lategame minion, so getting rid of it would hurt Tempo Songhai more than degenerative builds.
Variax: This seems like an excellent change. A good sidegrade that gives more counterplay to ramping her out. However, having so many cards that are demolished by lightbender feels pretty bad. Also, the wording sounds awkward.
Cacophonous: this upgrade seems quite strong. I’m pretty sure that Lilith and Cassyva would be running a strongly stated 4 drop that is all but guaranteed to trade 2 for 1. Personally I would change it to:
Dying wish: Destroy a random nearby enemy minion. Restore health to your general equal to its attack.
Desolator: I’m not sure what to do with this. It’s one of the only things propping up Abyssian right now and without cheap rush, Aggro Abyss is not likely to abuse it. Personally, I would wait until next expansion to consider changing this.
Plasma Storm: Plasma Storm is a fine way to keep swarm and Aggro in check. The only change I would make to it is to spare 0 attack minions so that structures are spared.
Silithars: Yes. Magmar Golems can burn in Makantor hell; Silithars are where it’s at! I’d go so far as to change Elder to 8/8 and veteran to 4/5.
Fenrir Warmaster / Matron Elveti:
Good changes, but I would like to take this opportunity to give infiltrate some support:
Infiltrate: Dying Wish: Summon a 3/4 ghost Wolve nearby.
Maybe this is too overpowered, but it sure as heck would make people want to play around infiltrate
Friendly characters not called Matron Elveti gain “Intiltrate: cannot be attacked my minions”
A lategame defensive bomb like EMP, but reliant on positioning.