Thats a good point, although I don't know where I could fit them in. It would also be nice to get rid of phase shields. I could probably drop one tower and count on the mulligan, but I would like to have at least 2 explosions if I was putting them in.
Maybe -1 tower, -1 fire buckler, +2 explosion
Edit: After some more testing, I think having the third fire buckler is important.
You may actually want to take out 2 towers for 2 explosions and count on the mulligan. You will still have a pretty good chance of getting a tower first turn.