Mighty True Heart

Finally, a Praxis Sentinel list that is consistent enough to grind gauntlet. As it currently stands, Arcanum's True Heart breaks the AI and will throw cards at it to try to kill it. The deck has plenty of card advantage and just enough life gain to survive aggressive onslaughts and control strats alike. Mightweaver + Mysterium Orb end games quickly. Give it a shot

Update: After a few more runs, I’ve noticed it can get stuck on 3 power in some games so could use some power base refinement. My current iteration is 4xPurify in place of Torch and power in the market in the form of inscribe (there’s a couple choices to try out). I will update the list after a few more tests.

Final Update: Here’s the final list I landed on. Currently 49-0 with this and it feels really smooth. Added Touvon, Skybreak Giant to market for the flexible top end option instead of power because power in the market was just too clunky and awkward here and the inscribe options aren’t anything special. I would much rather draw into the power I needed to curve into my sentinels on time. So I added more power into the main with 3x Amber Acolyte and 3x Desert Alchemist. I decided to cut Laser Blast and Shoal Custodian to make room. The extra removal was just unnecessary because this deck attacks through enemy units well enough and generates enough gas to grind down opponents easily.
Let me know if you have any questions or ideas on the deck. Thanks all!