I watched the replay.
Some would just sentence you to “GIT GUD!!”, but I think it’s more useful for you to get some advices, as you are clearly new to the game, and in a lots of dynamics and basics you are still lacking. If this is Tl:DR for you jump down, otherwise here’s a list of things I wanted to address:
- Dominate Will sucks, dust it/take it off.
- Craft Sandswirl Reader: they’re staples, you need them.
- Get better 6 drops/late game cards than Dust Wailer like Aymara Healer, Grapnel Paradigm or Swarmking Scarab.
- Criptographer is not a very good 2 drop with Zirix and would need a deck built around.
- Probably you use them for budget reason, but SoM (the mech) and Bloodshard Golem are of no use in your deck so get better (yet affordable) 3 drops asap like Fireblaze Obelysk or WIld Tahr.
- Get more proficient 2 drops like Pax, Primus Fist, Lavastorm Obelysk, Dust Drinker, Healing Mystic, Azure Herald or the golem package (Dreamshaper, Metallurgist, Celebrant).
- If you’re willing to get a mana tile as p1 place your minion diagonally to threat it and possibly get it next turn.
- If the opponent corner themselves, use the situation at your advantage and take more board, threatening the nearby tiles and forcing the oppo. minions and General into uncomfortable positioning.
- You wasted the tile with the mech. You could have placed higher as a threat or down near the tile to increase the chance to get it next turn.
- If you save the mana to your turn 2 or 3 you can play Blood of Air earlier on Desolator and/or Sarlac (very important in the archetype you played against).
- Don’t hit like you did with Sword of Mechazor just to push some damage: it’s a precious minion due to frenzy and you basically sacrificed it for nothing.
- Dune Caster is precious, you should have used Cryptographer in that turn Imo, and save the Dune Caster to buff a dervish later, to push more damage or remove a potential big threat.
- Desolator needs to die for your oppo. to generate value: don’t make it so easy for the opponent offering them weakened minions.
- Arid Unmaking: if you wanna use it do it smartly. Place the sacrificed minion in a strategical spot, possibly close to the centre of the board to have more reach, OR on top of an enemy tile.
- Falcius: if your opponent plays minion that re-spawn or come again like Sarlac or Desolator, don’t offer them fresh meat, protect him for the next turn. For an opponent that plays Desolator/has healing, taking 2-3 damage to trade a minion is no problem.
- Blood of Air, aka BoA: you should have used it on the Desolator when you were given the chance and stop the chain of value that generates by dying and coming back.
- Don’t waste 3rd Wish just to push damage, keep it for later or use it if there’s big threats to remove, not to pump a Poop Dervish and push 5 damage to a General that keeps on Healing.
- Placing Obelysks PROPERLY is hard, but generically you should place them in a way that can both be defended and pose a threat, so not too down/up or in corners (except in some cases the Fireblaze, as it’s very precious and you want to protect it). In late game use them to body block or offensively.
- Whisper of Sands is sucky; unless you play a Obelysk dedicated deck (and you’re really good at it) don’t play it.
- Pressure your opponent with big threats, you had the Scarab in hand and you should have played it earlier.
- Replacing is very important. You kept 2 BoA and didn’t use them when you should have, plus you kept Whisper of Sands with absolutely no need-use.
- Move the Iron Dervish (aka Poop Dervish) from the Exhuming Sands before summoning the new minion to always have new Dervishes at disposal.
- Killing minions properly: after casting the EMP you should have used the Wind Wervish to kill one Deso, than the other Poops to kill the other two Deso.
- EMP would have been threatening, but instead you left it as butchery meat to the Sarlacs, far from the opponent’s General. No, the fact that they used Ritual Banishing doesn’t justify/minimize the mistake you made in first place!
- Why on earth did you kill that Sarlac with the BoAired Mythron dude? This is the emblematic kind of distractions you can’t afford against Trial Abyssian.
After that you completely lost and it’s useless to comment.
Summing up: get better at positioning, get better cards and use them when they need to be used (BoA, Scarab), don’t give free kills to your opponent, protect precious minions but play them offensively when needed, generate the tiles in strategical places, use strategically the replace mechanic to dig for cards you actually need, use BoA on key cards to disable your opponent’s strategy/eliminate big threats when you have the chance and don’t always go face with your general ESPECIALLY if you don’t use healing in the deck.
The meta is not nice now perhaps, but trial Abyssian is a fair match-up for Vet, and when you’ll improve you won’t find it so impossible.