The only reason why I only have one copy of Doomsayer and Twisting Nether in there is because I only actually have one copy total of each.
And before anyone moans about the deck being bad let me remind you that that's the whole point. It's not made to be competitive, it's not made so you win, it's just a bit of fun watching the screen blow up with each card you play.
Any cards that you think would work well? I should mention that I have about 60% of total cards so any that do fit the theme I may not have.