I had been forgetting that I did want to post my deck here. Well here's Okuu for now. I threw in a comment for each of the cards, keep in mind these reflect my opinions only and may or may not be accurate or useful.
Okuu:
System Cards: I don't usually use these. I know some are pretty useful but I haven't worked them into my playstyle successfully yet.
Skill Cards: I will be adding in more of these later but currently I'm finding what works best for me. I had more at one point but I'm working on a better variety.
--1x Radiant Blade: (236) Not sure if I'll keep it, was trying new things. But it's alright. I may possibly figure something out for this, or maybe not.
--1x Rocket Dive: (623) Working on a good way to use this, may add more once I get it figured out. Except...
--1x Melting Pummel Kick: (623) There is the fact that I'm liking this card much much more, and they use the same skill slot, so I might drop Rocket Dive to add in more of this.
Spell Cards
--2x Light Cover "Nuclear Visor": Fairly useful for getting myself out of a corner or just plain getting the opponent away from me. A little damage is nice too.
--2x Explosion Sign "Mega Flare": I love these flare cards. Easy for me to land, good damage. Considering adding in more flares while dropping other cards I use less often.
--2x Burning Star "Fixed Star": I use this as a boomerang-like spell. If it's blocked on the way back, they're dragged back towards me and I grab them with a Melting Pummel Kick. Of course if they dodge or graze it instead, then I can't do that, but then it serves another purpose of removing them from that area one way or another.
--1x Nuclear Sign "Creeping Sun": Situational kind of thing but I didn't want to remove it completely. Sometimes I can get in a few good hits with it.
--1x Burning Star "The Ten Suns": Mostly gets the opponent away from me. If it hits, damage is always a nice thing.
--1x Geothermal "Nuclear Blaze Geyser": Considering adding maybe one more of these, it's pretty cool.
--1x Crow Sign "Yatagarasu Dive": One of the cards I may possibly remove. It's alright but I'm not too good at landing it.
--1x Nuclear Heat "Uncontrollable Dive": I like this one more than Yatagarasu Dive. If the opponent knows it's coming or reacts quickly enough, the whole thing is pretty much wasted. However if you can manage to land it, it's pretty cool.
--2x "Subterranean Sun": I love this card. Everyone sees it coming, and everyone recognizes it's card icon. That means it's easy for people to avoid it right? But in order to do that they have to stay out of it's area of effect. Just holding this gives me a very limited control over the opponents position. Of course I can't force them to "go here" or "don't go there" but they will tend to stay away from it's spot.
--2x Explosion Sign "Giga Flare": Basically the same thoughts as Mega Flare but I like this one even more. It's harder to land, but does more damage. You can always just fire it after the opponent does their own spell, if you know it's slow enough that Giga Flare will hit. This raises the problem of opponents holding back their own spells to counter your Giga Flare. However, the opponent not using spells isn't such a bad thing, if you can wear them down without spells of your own.
--2x "Abyss Nova": If you use this and Okuu starts glowing, the opponent will obviously know something's up even if they're new and haven't seen the card before. Glowing is dangerous right? You can't expect to land it all that often, but it's good for keeping the opponent away from you. Nobody wants to stay near a glowing Nuclear Hell Raven. If you want to hit with this at all, you need to force the opponent into blocking so they can't just easily get away.
So yeah. Basically a mix of offensive "Reduce stuff to ash" cards, and defense of the "Stay out of here or get hit" variety. I certainly won't call myself an expert, but I'd like to think I know what I'm trying to do, even if it may not be the best way of doing it.