I have no idea the names of the other dragunity cards, but from what I know, one should always max dux and phalynx

I'd also max red eyes wyvern too, and throw out the 4th odd dragunity card, and icarus attack, for 2 Bottomless trap hole

The only good Dragunities:
Dux
Legionnaire
Phalanx
Akyls
Mysteltain
Leyvaten

The last 2 are also purely optional. People think that Disaster Dragon and Dragunity mix well, but they just don't. Even Leyvaten Riders is a little situational of a deck. I would advise using one or the other, not both.

On first glance at this Deck, I fail to see where the "Disaster" portion of the name comes form, since the Original Disaster Dragon used Light and Darkness Dragon, which you do not.

Harper7000 wrote:

The only good Dragunities:
Dux
Legionnaire
Phalanx
Akyls
Mysteltain
Leyvaten

The last 2 are also purely optional. People think that Disaster Dragon and Dragunity mix well, but they just don't. Even Leyvaten Riders is a little situational of a deck. I would advise using one or the other, not both.

Mystletainn is really only good in Dragunity Assault Mode from my experience; most of the time, it's just not as good as the Dux-Phalanx-Vajrayana loop due to lack of flexibility. Besides that, I agree; these Dragunities aren't good for the most part, and you're not going to do much with this combo. Also, you can't even summon Thunder-End Dragon due it the Normal Monster restriction; HOWEVER, you deck would love Ennead, the Divine Heiroglyph Dragon. However, even to accomplish that, you need a few changes...

-Change Mystletainn to Leytaven. It's a better card all around.
-Drop Brandistock and Dark Spear for a 1 each of Dux and Phalanx, and a pair of Level 8 Dragons.
-Drop Dragon Control Art like a hot potato; sub in a Trade-In or two, depending on how many Dragons you end up with, and the rest of the slots with Terraforming (any deck running a field spell needs Terraforming...)
-You don't need Miyabi ANd Icarus attack; I'd keep Icarus out of the two, increase it to a 2 count, and add in a Super Rejuvenation.
-Dark Bribe isn't doing you any favours; you're negging 1, and while some decks can get away with that most simply can't. Replace them with Cards of Consonance, which lets YOU draw cards, fuels Dragunity and Super Rejuvenation (see what I did there?)
-The Level 8 Dragunity Synchro (can't remember its name)? Yeah, you're better off with generic Synchros with better effects that don't clog up your Spell and Trap Zones. I would choose Scrap Dragon and Crimson Blader.
-As said before, change Thunder-End to Ennead
-You do not need 2 Starlight Road in the Side Deck when you main 1 and only have 2 Stardust. I'd swap them for Huge Revolution is Over. Speaking of the Side Arm, love the Maxx C, but the Dragunity stuff needs to go. I'd swap them and 1 GEPD for my 3 Staple Traps, 2 copies each - Mirror of Oaths, Black Horn of Heaven, and Chain Disappearance.

These are my suggestions. You can feel free to follow them or ignore them.