I just took the Xenan Talir list and switched out Azindel and Talir for Suppressor and Valiant, and changed the market a bit.
I was very impressed on how consistently Valiant Guardian won games on its own.
This list took me out of Diamond 1 to masters, though my field of opponents was nonstandard to say the least.
The Onoris Roa slot in the market can change, though this deck having no life gain and Onoris representing a potentially huge amount of life is nice.
interesting list. Could you tested the Xenan Blueprints as you mentioned?
Did you consider Twinned Spiteling in place of Sandstorm Titan? The don't fly ability don't seem to matter much at least for me.
I would swap Exploit for Curtain Call to protect my bombs although I understand why it is in the deck.
Best regards
BIGnatius