On the main, some Ideas.
+ May consider running some Effect Veilers, since there is sh- load of Incarnated Dragons everywhere now, one Effect Veiler agains't a Mecha Phantom Beast, not allowing they to summon LADD can just... save you.
+ Fire Fist Bear (Yushi), with these Tenkis can end being a "Last Resort" agains't some cards.
+ Pot of Duality, I mean... if you wanna make it thin, Duality, even if Constellars aways need to SS, it is not a problem if you have Bear.
+ Safe Zone is kinda Good on this deck... Since the incoming meta barely runs backrow, probally soon you won't have to worry about a bunch of MST's too.
+ 1 Sombres, just too good, running 2 Sombres is like running 2 Cecylons on verz deck in my opinion.
- Photon Lead, they heave so much power to go to the field, unless you wanna make a Shock Master or Ouroboros, I don't really see a reason to run it, 2 Kaust on hand? or Maybe Kaust + Sombres First turn? idk, I don't think this card is really efficient if you draw on it.
- Mind Control, you have no tuners... it is a XYZ deck, if your opponent is idk, with a synchro deck, and just pop out a bunch of lv 6 like fire fists rank 3, or the deck is just around lv 2, etc, without tuners, there is the -possibility- of this card being useless, but sure it would be nice on the side(Considering Elemental Dragons/Spellbooks)
- Star Sign of the Contellar, it is mostly likely, going to work if you wanna overextend (Wich is bad), otherwise it won't be a big deal, you use one card... make a xyz... draw one card... it's just not fast enough.
- Reckless Greed, I mean, yeah, a lot of people will disagree with that, because it is a -1, you set it (-1), you use it (+2), you stay 2 turns without drawing (-2) subtotal = -1, unless you wanna OTK, I just... idk...
On the Extra:
- 1 of any cards at 3, the only card that I think is worthy of running 3 on the extra is Ophion on verz, or idk, there are decks where it is worth, I don't think Constellar is one of then, since you need possibilities.
- 1 Beehive, because 1 is just enough, if the deck is fast enough, you won't have time for a second one.
+ Zenmaines, because Zenmaines is Zenmaines.
+ Gaia Dragon and Volcasaurus IF you remove Adreus, Volcasaurus + Gaia Dragon is just a faster combo that can grant a win on the same turn, since it's kinda common do to like, 5000~6000 LP damage when using Vulcasaurus effect, and then overlaying a Gaia Dragon on it, if you just wanna get the monster out of the way, Pleiades would be a better option than Adreus too, so yeah, Vulcasaurus + Gaia Dragon.
+ Radiant Photon Paradios. Can't deal with one monster you opponent controls? You can't make a rank 5 this turn? Oh well, problem solves, and you still draw one card when it is destroyed, another "Last Resort" option.