Praxis...?

Dear BIGnatius,

I'm not going to lie, I have not seen spiffirific's version of Praxis, but the following are reasons going too over the top is not a good idea:
1. Vara's Authority. You do get some pretty strong draws into the fabled T4 Azrog, Streetbreaker, but also be prepared for the possibility that all your power dorks (Apprentice Mage/Open Way Supplier) are going to get swept. Since every Primal deck is playing Plunk, Wumpkin (even the control decks), it means every Shadow Control deck is playing Authority. Thus, you might be able to drop a dork, but don't count on popping off with them. Hitting 6 power for Azrog is far more manageable than 8 for Kiln-Titan/Ravid. (Since you do want to play Ravid and a power in the same turn, ideally.) So it is harder, at least in Praxis to hit that.
2. The 6+ drop problem. The other issue is that the cards that you mentioned don't have Inscribe, which means you do get draws where you're stranded with 3+ 6 or more costed cards and no way to deploy them. Yes, Inscribe is helpful for smoothing out power/non-power draws, but you don't actually get a lot of card advantage in this deck. And while it's not as prominent as it was before, Ulixa, Unspoken Terror is still certainly still a concern for having too much top-end and having your hand susceptible to getting nuked. I've found just the 4 Azrog is exactly where I want to be.

I think if you are considering going over the top big with massive haymakers, Combrei feels like the way to go. Both Jada, Peacekeeper and A New Beginning provides Sigil-based ramp, which means it's more permanent, but more importantly, you also get Harsh Rule on 5, which both dodges Ulixa and helps clean up your board ready for haymaker after haymaker. Not confident what that entirely looks like, but I believe that is a more promising shell for the type of deck you are looking for.

Best regards,
stormguard798.