This is the Swain/Leona deck I have settled on. Daybreak cards to contest early/mid game, Swain/Lev + Stargazer to win late game. Went 8-2 so far, close to Diamond rank.
Tech card explanations:
*Zenith Blade was in this deck and it was working well enough however Culling strike hits this meta quite well. Culling strike can hit targets more frequently because of hush.
* Star gazer is a two of as an extra security for late. There are many late game decks at the moment and sometimes the Leviathon is not enough. In an optimized meta I can see star gazers being cut But for now it feels fine.
* Bastions are in this deck to protect the big units. There are many comets and meteors in the current MehaSo I need the extra protection. I can see discard being cutIn the future.
*Hush is too powerful not to include at least 2 of in any Midrange/Control Targon deck. Really shuts down support decks, Elusive decks, cards with spell shields and various buff cards. Super versatile and game winning.
I have a Yasuo + Leona deck as well that has honestly worked better than I anticipated. It just needs to fit in a few spot removals so I am still tinkering around with it. Singular Will has been game winning. Not some tier 1 deck but it works well synergy wise and that deck definitely is running Zenith Blades.