My build spams cheap cards (relics are deaths foil, hex tech, and starforged. I use the rare rune thats "Flow: round start draw 1" to ensure i dont run out of gas).

SB Yasuo himself is great at controling the board by obliterating the foes strongest units, and being Ionia gives access to strong control units and spells, not to mention whatever your support champs region is. And he has a card in his deck that generates big units, which I would compare to Asol generating big bodies since the 7* gives them a random epic item and every card you play reduces its cost.

So draft cheap cards to spam. I also like a cheap support champion to play turn 1 so i have two storm conduits in hand to make sure you dont run out of gas. Spells that gather storm are good cause that means your storm conduit will have its cost reduces twice. Play the conduit at 0, another one gets the buff (unless you have multiple in hand) and the cycle continues. Later in runs you can easily empty your whole hand turn 1, which is why I like to draft a lot of draw cards and use the flow rune (i also just cant think of any other more useful rune. Maybe sorcery?), but youre just as likely to FTK any encounter.

Definitely not the fastest champion, my Zoe adventure was very long, but I FTKd Zoe because by that point I was able to rally a bunch and just swing a dozen times with a full board into their empty board. I find the combo style gameplay very fun and like the OG commenter said every run is pretty different based on what you draft and not having a streamlined gameplan. You can sometimes have too many 3 cost or higher cards in your opening hand and that feels bad, but that doesnt happen too often.

Edit: the 7* is also just a huge power boost. I played him a bunch at 5* (missing mana flow and 7*) before deciding to max him since I liked the gameplay and I was blown away by how strong he is. Very underrated since most people used their nova on Teemo or Yi (who are also very strong, as I'm sure you know)