Notes & Combos
The goal of the deck is to first try to get as much monsters on the field in order to thin our your deck, with the goal safely obtaining "Synchronized Realm" into your hand without getting it discarded to the grave. One giant con is that you'll be using a lot of time to pull your combos so you need to play cards quick.
(Disclaimer, I don't really know their names by heart, only their pictures so you'll be seeing that a lot below.)
Prioritize looping into lv 6 Cardian Synchro girl and draw via her effect, de-synchro to get more Cardian effects off, and then re-synchroing into her. If you play it well without interuptions, you should safely be getting your "Synchronized Realm" and can eventually loop burn for a win, hopefully OTK. If you can't kill for game, at least end with your lv 8 umbrella boy in defense mode, preferably 2 of them so that your opponent will take 3000 points of damage on Draw phase alone.
The only cards I would prioritize is just to have your lv 1 Cardian on the field and never letting it hit the grave since you have a few monsters in the deck that need at a low level Cardian monster that's up.
After that, the next biggest card to always loop is your green giant trunade looking cardian to recycle either your lv 6 synchro girl or more green cardians. Last priority would be your bug looking like cardian since it acts like a magical mallet to safely shuffle your cards and reset in hopes of getting out a full 3 card "Synchronized Realm" board.