OK, so here's what I recommend.
2 Consecrated Light
2 DD Crow
2 Effect Veiler
2 Nobleman of Crossout
2 Bottomless Trap Hole
3 Royal Decree
1 Royal Oppression
1 Mind Crush
It's unlikely that you'll see very many GB decks, but I included enough in the side deck to deal with them (2 Veiler, 2 Bottomless, Oppression).
Blackwings are actually my main deck right now, and I'll be the first to tell you that there's really not that many great sides against them. Royal Decree is great and if you go first and get the Decree up, you're probably going to cruise to an easy win, but almost all (read: good) Blackwing players main deck (or at least side) 2 MST, as well as one or two Seven Tools of the Bandit. Consecrated Light isn't really that great either, as most Blackwing players expect to see it in games two and three and generally have their own outs to it (sided Cyber Dragon and Thunder King, as well as mained Book of Moon), but it's really all you can do. You already main Cyber Dragon, so that will help a lot in this match up as well, since its high attack is really hard for Blackwing players to get over. Bottomless will also be golden here. Blackwings play very few monsters (usually around 17 or 18), and if you can take out their big beaters (Shura, Sirocco, Bora) then they're kinda screwed.
Sabers might give you a little bit of trouble simply because they're so much faster than your deck, but this is where Royal Oppression and Mind Crush come in, as well as those glorious Book of Moons! Do whatever you possibly can to keep them from getting two face-up X-Sabers on the field. As long as they don't have two on the field they can't Faultroll swarm you, and that is really the only way that deck wins. Side in your Bottomless Trap Holes as well, these will help you stop their Boggart Knight plays. Also, whatever you do, SAVE your Mind Crush for that crucial moment where you know they're going to summon Faultroll. If they manage to get through your Books, Bottomless AND Effect Veiler to summon two face-up Sabers, chain Mind Crush and declare Faultroll and then enjoy the look of horror on their faces.
It sounds like you already know what you're doing against Quickdraw, so I won't touch on that much other than to say that Royal Oppression is again absolutely amazing in this match up. If you can get Oppression up they literally cannot win. If that fails, D.D. Crow and Nobleman of Crossout will go a long way in pissing them off. Be smart about your Crow plays though -- try and save them for those crucial moments when they summon a Debris Dragon and target Dandylion or when they Pot of Avarice and remove one of their targets, because then the whole effect of Avarice fizzles.
Gravekeepers are a tricky deck. I don't have much experience playing against them, but I can almost guarantee their Necrovalley plays will wreck you. You don't main or side MST either, so this could prove problematic. You might want to try and squeeze MST into your side deck somewhere. I can't see dropping anything in the list I suggested though. Consecrated Light and Nobleman of Crossout will be great in this match as well as Effect Veiler.
That pretty much covers everything. Let me know if you have any more questions.
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I love my Crystal Beasts XD I've had them for about 4 years now and its my favorite deck to use.
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