((8+(6x2)+1)x2)x3=126 for your deck, and
((13+5+1)x2)x3=114 for mine.
Your deck has two advantages: it can OTK someone who has used one SoD, and the dragons are resilient enough to last more than one turn. My deck was able to produce EM because Arctic Dragon's +5 attack allowed me to cut one card from my 100-damage combo... you need a second Rage Elixir to duplicate it with Massives.
The only dragons that will allow the inclusion of LS in the seven-card combo and still grant 100+ damage in one turn are those with at least 11 attack and 5 health, or at least 10 attack and 6 health. Ivory, Jade, Golden, Sky, Obsidian, and Basalt Dragons can also pull it off, though Ivory runs closer to the 100-damage minimum, and the rest cost an extra quantum. Light Dragon cannot be fueled on Supernovas alone, and Amethyst Dragon clashes with Supernovas, though the mark may solve that over a slightly long game.
Jade Dragon is actually a VERY viable alternative if you don't mind the extra quantum of cost, which would in some situations prevent you getting out the combo in time to kill a fast opponent - that is, before your final Supernova. It has excellent stats, and allows the use of Rage Elixir - you can get the same attack and end up with three dragons with 4 HP instead of only 1 HP. That means you can get a 2TK if needed, or even produce the combo early in order to salvage a losing game.
Thinking out loud here, and I think I've convinced myself. Switching to Jade Dragon!