There are several issues with Sajj that hold her back imo.
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Her “focus” on Artifacts. Honestly, i can’t even imagine an Artifact/combination of Artifacts that would be good enough to make that archetype a thing. Especially early game playing minions is just far too important, i think i have lost every single match i ever played where i used my p2t1 to equip Ank, even when i killed the enemy minion with it. I was never able to compensate that tempo loss. Relying on Artifacts means to forfeit the board, and Sajj just can’t do that. She doesn’t have the mobility and removal options of Songhai. The only roles Artifacts can play for her are supportive/comboish. The combo part is so inconsistant that it will never be more than a meme and when you run them for support, well that’s fine, but what do you do with the rest of your deck slots? This brings us to the next point.
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Pretty much the entire Vetruvian faction is either Artifacts or Obelysk/Dervish related. The Artifact supporting minions are mostly trash and can’t be played effectively. So you are left with Obelysks/Dervishes to fill out the rest of your deck and at this point you will have to ask yourself at some point, why do i not use Zirix when most of my deck is dervish related? I mean it’s not like Zirix can’t make use of Falcius/Hexblade/Ank which are basically the core cards you will use in a Sajj deck. In fact, most of the time, they will be just as effective as with Sajj. There is just no dedicated support for Sajj within the faction, the few cards that are better used with her hardly outweigh the cons of playing her.
For Sajj to find a niche in Vetruvian she would need non dervish related minions and spells that allow her to successfully play a more controlling late game. Get through the early and midgame using efficient minions, her BBS and stuff like Hexblade and then win in the Lategame using winconditions like Spinecleaver. I’ve played a lot of games with a deck like that, trying to make it work but it’s futile. With the tools available right now you just don’t stand a chance in the lategame against other factions, you will just get outvalued. Also, using Sajj BBS to gain Tempo comes at a price, she is using her health for it. Unlike Vaath however, she has no way to regain health. Against fast, aggressive decks you often find yourself at like 12 life by the time you hit 6 or 7 mana. That would be the point where you wanted to bring your lategame Artifacts into play but with 12 life against an aggro deck you don’t want to hit anything with Spinecleaver, just running away is the only thing to do here. Vaath would just Earth Sphere himself out of trouble, the only thing Sajj has are Azure Herald and Healing Mystic, that’s not nearly enough. The next thing missing to support such a playstyle would be a decent removal set but in this regard Vet is just trash. Yes BOA is amazing but that’s it as far as ranged removal goes and mass removal is non existant. Well we have Wasteland Wraith but a mass removal that you opponent can just remove before it goes off is really bad when you want to play a controlling game.
That aside, what options does Vet even have to win lategame? They have great value Minions, Nimbus, Aymara and they have Spinecleaver, that’s it. And again it’s just not nearly enough. Nimbus and Aymara are strong, but they are minions at the end of the day they can be dealt with rather easily. And they are very slow, even if you manage to stabilize the game and play them, your opponent usually has a few turns before they will kill him, time enough to turn the tides sometimes. Spinecleaver does a good job at winning in the lategame, but getting more than one totem out of it in a game with so much burn and ping is really difficult.
TL:DR For Sajj to work it would need more healing for early/midgame, more non dervish related minions, and decent win condition for the late game.
