Soothsaying

I rather like this deck. I approached it with the idea "How can I trigger Lethrai Soothsayer consistently?" And I reached the conclusion that aegis units are the way to go, plus some mirror image effects. Don't take my word for it, yetis are probably better at it.

Pledge/Bear Guard Bayonet is for getting more consistent power and ramping to stuff like Eilyn and your more expensive market cards. I think you need a certain critical mass of pledge cards to get bayonet off consistently, and it's more than 8.

Howling Peak Smuggler is very relevant since you use a lot of spells that deal damage between Jotun Hurler, Torch, and Soothsayers' Premonition Bolts. I'm not sure if any other spell damage+ cards are worth running. I'm only running Innate Conviction because I've pulled two and the spell damage on the Arc Dragon is sometimes relevant.

This deck can and will be refined, I'm just not currently sure where improvements could be made. You could probably do some Mind Link shenanigans as I'm already running Rain of Frogs, Tamarys can be replaced - possibly with Decimate. More card draw would help, I could see Eilyn's Sanctum or even Enemy of My Enemy if you were feeling particularly meme-y and wanted to shift into Ixtun colors (which would help, the deck often needs Harsh Rule effects)