Honestly, for a deck that lookins like it's using Valkut is a primary (not necessarily main) source of damage, I think this deck could use some more land fetch.

I think you could drop to 2 RR and up it to 12 mountains, people aren't going to tech-edge your RR's when you are dropping valakuts.
 
too many counters going around, I prefer cultivate over harrow.
 
I would likely go 3 hero / 3 inferno ... you'll get the mana.
 
Bring it today though, looks interesting.