I am working on building an izzet blitz deck with the release of amonkhet's soul-scar mage. Any suggestions would help; here is the deck so far:

10 Island
11 Mountain
4 Anticipate
4 Built to Smash
3 Fevered Visions
2 Insult // Injury
3 Mercurial Geists
3 Niblis of Frost
2 Rush of Adrenaline
2 Shock
4 Slip Through Space
4 Soul-Scar Mage
4 Stormchaser Mage
4 Uncaged Fury
Sideboard:

4 By Force
4 Dispel
1 Fevered Visions
4 Magma Spray
2 Shock

This deck is meant to be a fairly fast aggro deck, although there are some controlling aspects of it to close out long games, in Nibilis of Frost and Fevered Visions. An ideal hand would contain a one or two drop creature, and a couple of boost spells and card draw.