Hi Stephen & Kevin
I'm Jacob Kory, 2nd place finisher from the event.
As Kevin already alluded to in the podcast, my Stax's deck basis was indeed from Terra Nova. An earlier invocation of it consisted of all 8 creature lands. However, it struggled against Eldrazi of all stripes, as well as "Other" deck types like hatebears. Consequently, I reworked the mana base a bit, added some new flair from Kaladesh (Inventors' Fair), and reintroduced Karn to provide some sort of Wall of Stone against Eldrazi. Of course, he works to destroy Moxen reliant manabases as well.
I had considered Ensnaring Bridge as a sideboard card, but ultimately elected to triple down on Tabernacle as a more effective answer to attacking creature decks. For instance, I would not consider Ensnaring Bridge as a useful card against Oath decks even if they do win with creatures.
Interestingly enough, Rich Shay and I came to a nearly similar core of the deck independently, and during the week leading up to the event I borrowed his mana configuration by adding Inventors' Fair and Urborg to my deck.
Also, during Game 2 of the Finals was the first time in the entire event and also my first time having Inventors' Fair as a decision tree. My immediate threat to answer was Jace TMS, but in retrospect, there is good argument for taking Smokestack and following up with Phyrexian Revoker on Jace. It was a nuanced decision that was colored by my loss in the Swiss rounds to a Jace ultimate out of an Oath deck.