Norika yamazaki deck help

[Varatius]

I'm looking to turn my norika Voltron into a stax build that the goal is to end the game with urborg, tomb of yawgmoth and karma maybe I'll die maybe they will who knows.  Anyway I was looking for suggestions on lesser known stax enchantments because I just want to use lesser used options for this list bonus points if it adds to the combo.

[Aetherium Slinky]

Here's the deck in question:
https://deckstats.net/decks/117870/2434619-norika-voltron