get rid of frostburn weird an I myself don't like shred freak for the dmg you could do i like using Gore-House Chainwalker
definitely get a full set of ash zealot and the noble. Hellrider
is a must have for then deck it just helps so much. I myself also would drop Pyreheart Wolf
for Boros Reckoner
dont get me wrong if you looking at budget then keep the wolf its not a bad card and has its purpose but reckoner is just silly powerful in standard right now.
As far as sideboard drop anything with blue in it. Put in Skullcrack
helpful against anything with life gain and thragtusk games. Keep the volcanic strength and take out its pit fight really not going to help you alot in the deck.