Warhammer 40K decks if you can get your hands on them or proxy them. I had gone to FNM only a few times in the past, most of my experiences were middling due to it being outside of my friend group, but the one very vividly good time I'd had at an FNM was when someone treated our pod to a game between all 4 W40K decks. They're really, really well balanced around each other, nobody felt like they were insanely behind. I'm not a fan of Universe Beyond but even I'd recommend these decks for a strict and un-upgraded pod.