I believe that, vs. precons, you will simply be able to win via activating Kenrith over and over again with Zirda's deduction, and, knowing you will draw lands every single turn be able to mulligan to either protection or ramp.
I think the deck could probably use more sac outlet lands, and playing the scry lands / halimar depths / etc. might be a good idea to help hit the protection lands.
The manlands are a decent mana sink later if you somehow lose Zirda to an exile removal spell (which is not really in very many precons, mind you). It's possible there should be more manlands, and I forgot urza's factory which is quite good with Zirda
Backup plan is to store up mana on storage counter lands and pump that into Kenrith for lethal voltron damage.
Hit me up with your thoughts on stuff I missed, or if you get bored enough to try a similar brew