My first attempt at a standard deck, too bad I could never afford it. I built this because I love Chandra, I love Phoenixes, and I love Burn.
Before you leave comments please keep in mind I have never played standard so I have no idea if this is a good deck or even tournament legal. So please don't troll me.
I wanted to go mono red but Since Theros is an enchantment set and Red has no way to deal with enchantments I went with R/W so I could add Boros Charm and Warleader's Helix.
Still not sure if I like the Boros Reckoner more than the Legionnaire.
I like the direction this is going. R/W burn seems like it could be quite powerful. I do question the reason for Wear / Tear in your main though. I would probably run a full playset of Shock instead (probably cutting a land for the fourth). Typically burn decks don't want any lands that come into play tapped, so I am unsure of how well 4 Temple of Triumph really are, I myself would probably not go over 2 if any. I also think you'd like Boros Reckoner a lot more than the Skyknight Legionnaire .
Your sideboard looks pretty good, though if you do run the Reckoners main I would move Act of Treason to your sideboard.