Is there a reason you have Ojutai Exemplar in the deck? you're only running 14 spells and the spells are hardly combat tricks, mostly creature deathtouch and enchantments.
I would suggest
Malakir Cullblade in their place since your thing is first strike deathtouch. It could make him pretty big. Also with so many creatures costing 3 or less you should run less tapped lands and swap them out with pain lands.