A couple of things..
1. I don't think you need Steal. You don't need to get opponents permanents, all you need to do is destroy them. This way you don't need to take those Darkness Pillars.
2. Take Pulverizer. A couple of them. They are perfect for this kind of deck.
With Pulverizer you need to change your mark to Gravity which is perfect because you can then also take Gravity Force.
Also I don't think you need Earthquake. Who cares how much quantum they have if they are totally shut down.
Originally, the deck didn't run weapons or shields, so I added the steals to be able to take them from other players to prevent them from killing me too quickly. Also, the Earthquakes were meant to shut down quanta production, but you're right, if I replaced the Darkness with Fire, and used Explosions, that would work better.
Btw, if you checked my next post below the OP, you'll see that I added a Gravity Version as well. o-o
Ah, so you did
I only saw decks 1 and 2. Too much coffee I guess
Using Explosions works but I still feel Pulverizer does the same thing, only better. If you get Pulverizer with Protect Artifact early on, you cannot lose. Mark of Gravity enables you to use Pulverizer every turn and you can quickly destroy all permanents of your opponent, forcing him to draw only one card each turn which guarantees your victory. Without Explosion, Lava Golem and Rain of Fire, you only need to take Earth Pillars. Dragons do the same thing as Lava Golem and Rain of Fire can be replaced with multiple Gravity Force.
Next I think I'll try some other element but I think Earth or Gravity is the only way to go because of Pulverizer.
Anyways, thanks for this great idea. Playing rainbow was getting boring.