I was so concerned with Kain's control effect being downside or needing to hurt the opponent that I hadn't even considered the card could instead switch sides but give you an upside when you gave him away
It was kind of an aggro/control deck often winning by drawing almost your entire deck, playing it, sacking it to Auratog and swinging in
While discarding a significant portion off the opponent's deck is effective, keep in mind that the attack also discards the player's deck
Token generation, built-in protection, and a decent card on rate
Rootcast Apprenticeship and Verdant Command can each give you tokens, but also a ton of other modal utility
You can focus your entire build on generating treasure and overrun effects, and then just swing in