This deck is a combination of floodgating, board-breaking (some in the main, most in the side), and hand control via Yata Garasu. In my main, I love versatile cards that work well 1st or 2nd. Examples of these are Jowgen and Moon Mirror Shield. When side decking, I only run a couple of additional "going 1st" floodgate options, Summon Limit and TCBOO. I used to run 2-3 copies of Dark Bribe to protect my board, but I've recently dropped the card in lieu of running more "going 2nd" cards in the side. All of my "going 2nd" cards are board-breakers. No hand traps whatsoever. I feel like hand traps are terrible in Stun. Most meta players can play around 1 or 2 hand traps, and you, as the Stun player have now depleted your hand of 1 to 2 cards just for the sake of mildly slowing them down. I prefer to let them over-extend, build a big board, and break it.
Oh, and Yata Garasu ends up being the MVP pretty frequently. One of my biggest fears as a Stun player is my opponent drawing "the out". However....you can't draw "the out" if you can't draw at all....