OP deck. Their 0 DEF is not even a weakness considering you can't attack without the opponent banishing and destroying your monster before it goes through. Also, Spiritmaster being an R instead of a UR, hilarious. A mess.
It's not OP at all. I easily beat Shiranui with a Jet synchron deck LOL. I shuffle the synchros bakc into the deck so the destruction protection is useless. Sounds like you guys are just having bad matchups with your deck, because this deck doesnt need to be limited at all. Remember when Vendreads, Ritual Beasts, ect were all considered top tier? Most of these minibox archtypes dont need a nerf.
How is Shiranui op?. It’s extremely strong but it has tons of weaknesses that balance it out. The 0 def is just one of them. Floodgate is extremely disruptive and clogs up our field with a set monster that can only be gotten rid of by tributing it using Solitaires effect.