I don’t believe in asking for feedback without giving in return. Here’s the whole shebang 
@coldhands
Frosted Springs
Massively superior to Earth Sphere. The continuous General heal in addition to minion healing… despicable. It’s a little overpowered but thematically it’s great. No reason to change the mechanics, just a little number tweaking.
Icestand Obelysk
Perfect. Wouldn’t change a thing, and although I’ve seen a lot of Dervish Permanence concepts this one makes the most sense in my opinion.
@oranos
Deathfire Cannon
Pretty standard, has the same weaknesses and fills pretty much the same role as Scarab except 1 mana more and infinitely more potential. Really feast or famine, and we all know how those cards work out in Duelyst. Still, it sounds awesome, particularly in combination with free bodies from Zirix BBS and Obelysks.
@eternamemoria
Calamitous Scavenger
It’s not great, I’ll be honest. 5 mana for a 3/2 body that fills your hand with either replace fodder or insane value (think Obelysk and Abyssian counter). Also, Natural Selection renews itself if you cast it, so your hand size never goes down. Your action bar is more or less stuck until this minion dies.
The best synergy it has is with Aethermaster, since it will draw for you like crazy, but it doesn’t fit a single Magmar archetype and the rebirth seems just tacked on to make it more annoying. I see what you were going for, but this minion seems designed to drain your opponent’s removal and keep your hand unreasonably healthy.
Sunmirror Obelysk
The name deceived me into thinking this was a Lyonar minion. This minion’s risk to reward is pitiful: 4 mana for whats basically a single 3 attack dervish. A cool positioning idea, but it’s just too weak even in comparison to Fireblaze Obelysk, which costs 1 less. You should probably rework it.
@anastenazontas
Essence Freezer
Why are all the Deathwatch cards so broken :< Stun is really goddamn strong, and Deathwatch is easy to catch when you run Snowchasers and the heaviest removal faction in the game. I’d remove the General stun at least: Beam Shock and Zendo should teach you that taking away your opponent’s ability to act just feels horrible to experience. A cool idea, but I can’t condone this existing in its current state.
@deathsadvocate
Shinobi of the Frozen Moon
Cool concept bro, but it’s a bit too similar to Katara with less synergies. You are right about it being weak due to lack of mobility, but Katara has Shadow Waltz, Killing Edge and other synergies to make up for when you can’t get a backstab off. I think the risk/reward is a little off: at worst its a 1/3 for 1, which isn’t horrendous anyway, and at best you get 7 damage on the enemy General (basically a 1 mana Spiral Technique)
@mrmana3
Silithar Guardian
Comparing it to Dreadnought I can see it being a little too strong with certain cards such as Silithar Elder and Chrysalis Burst, the Zeal feels tacked on and it doesn’t have Rebirth despite being a Silithar (theming baby!). Still, a neat idea 
Iron Cloth
It doesn’t actually work for the contest, but I love this idea
Really fits Vet’s close range spells and high value high health minions. Honestly its stupid strong, but it makes good competition for Lyonar’s Regalia. Wouldn’t change this for anything.
@skulldragon42
Unnamed Magmar Minion
Low stats for Magmar for not a strong enough effect. I like the concept (Starhorn synergy ftw!) but the body is a massive loss considering the enemy card draw. Could stand some number tweaking and a refocusing of what its actually supposed to DO.
I’d suggest the name Nidhoggr btw, but that’s just me.
@akurane
Lifesurge Obelysk
You could’ve made this a 3 Mana 0/5 and it would’ve been fine. I love this concept, it ties in well to immobility of Structures and Vet’s close range affinity. No complaints at all 
Apprentice of Sands
Underwhelming for 5 Mana. Considering the implied cost of artifact investment, I’d suggest lowering the mana or raising the stats. Even without Zeal this would work, but its got extra thematic strength from the ability 
@gabriek
Shadow Assassin
Clever idea, but baiting dispel with a 4 mana card is a little counterintuitive. I like the concept overall, but you could reword it to just say “Summon a Shadow Assassin nearby a random enemy.” instead of getting all fancy with the parentheses. Its a tricky card to play around, but its certainly possible. Thematically solid for Abyssian, I give this card a 7/10 
dewize
Blazing Behemoth
Firebreathing Dragon is cool, a plain 3/3 is not. Uninspiring, but solid. I don’t really know what to say, it’s just a solid card.
telvoc
Ziggurat
Doesn’t break any rules. Breaks the goddamn game though. Consider this: you summon a dervish and smack it against the enemy general. It dies. You get another Dervish. Repeat until victory. At only 3 Mana too, wtf. This one is horrendously OP and that’s a rule violation in the contest
I’ll admit, that was the first combo I thought of as well, but it’s just too silly with Rush Dervishes.
And that’s all of them. Wow, this took a while.
edit: sorry telvoc and dewize, I can’t mention more than 10 users in a post.