Why are you using fire bucklers instead of say improved fog? If your opponent had enough damage output his creatures would kill you even if some of them died along the way. You could actually put in one improved antimatter since you're using mark.
Recommended modifications: -3 fire buckler, -1 protect artifact, +2 improved fog, +2 improved antimatter, -1 quint, +1 flying weapon
I really like where you are going with this. Antimatter is such a great card. Of course, with antimatter in, fire shield has to come out. I do not approve of taking out 1 protect artifact, as I do not believe it is effective to have 1 of any card in a deck.
Maybe -3 fire buckler -1 tower, +2 fog, +2 antimatter
Actually, are the Towers entirely necessary? I haven't played the deck (But it looks fun, and I'll definitely make it when I have the cards) but it would appear to me that the Supernovas could give you the 2 to start it off, and then let you play the Brimstone Eaters which can easily fuel the rest of your cards. Ofc, you'd be faced with the problem of having to draw them both to actually get anything done, which actually makes me think that they are good. Also, you can get them fairly easily due to auto-mulligan.
I actually started this deck pillarless, but the problem was you always had to discard 1 or 2 cards. I am now working on a variation with 6 novas and 3 or 4 cremations. Mark likely will still be entropy, as I like the antimatter idea. It looks to be working pretty well.
In general, I really like where this deck is going. Thank you to everyone for the great feedback. Check back to the main post soon for an upgraded version