Short answer: no room

Longer answer: You could replace the inferno titan or a couple other spells with the shivan. For me based on what I wanted in the deck it was a choice between the shivan or the siegebreaker. With all the token and aggro decks running around the 2 damage to all non-fliers on attack I thought was better than increasing combat damage for spare mana. While not a dragon the inferno titan fills a similar role to the Shivan and has the added benefit of picking off small creatures.

Hopes this answers your question

Been messing around with this Land destruction deck recently, its actually been doing surprisingly well only lost one game so far against mono white. Deck can go infinite although pretty unlikely its going to happen often but you usually win by beating them down with pyromancers and Guttersnipes while they're stuck on 2 land...

Electromancer has been MVP so far, being able to cast and flashback think twice for 3 mana is beautiful, land destruction on turn 3 to prevent Cultivates, and a 2/2 body against a aggro decks is great against tokens/rabblemasters. Not sure i like the archaomancers though, feel a bit slow as unless you flood out you can't really play one and then blow up a land on the same turn.

This deck is awesome as hell! Been playing 2015 with friends lately (we've planned to start the Origins on Wednesday but we all know how that worked out) and discovered this build just yeasterday. Damn, my friends are angry at me now So many tokens so early and so many synergies... Thank you!