The rest of the deck was basically just things to make it reliably able to apply early pressure and staple good black and white cards to keep it competitive
Since Tivit is in white, blue, and black colors, you have access to the best control pieces as well as the ol reliable Thassas Oracle combo to close out a game when you need to
A new five-color commander in Go-Shintai of Life's Origin, a Shrine that loves everything to do with even more Shines, has dominates plenty of commander games with its incredible consistency
Theres the obvious wheeling, but even without, the card is going to do some very heavy lifting
There are currently 14 (fairly old) cards, like Necromancy or Thawing Glaciers, which have a triggered ability that reads, at the beginning of the next cleanup step (those of you who have been paying attention obviously realize that these 14 cards give players priority during the cleanup step!)