Lots of cards I like! But... to many creatures dying to light removals probably. Brimaz is really good in this deck.
Are 20 spells enough to trigger efficiently Pyromancer and Mentor? With Menor you will probably want more than one Zealous Persecution, they are amazing together.
What about Goblin Rabblemaster? He drops token each turn (even the first one youplay it, if you declare a war phase) without depending on spells.
There is a DEGA midrange (BWR) forum in "Deck Creation".