Been toying with this deck on Cockatrice the last few days with a lot of success. Main deck card selection:
Elvish Mystic In this deck, it's my only ramp. In trying to be aggressive, I can't afford to draw more dead ramp late.
Heir of the Wilds Any deck trying to push the pace of the game needs to be able to get through courser, and this guy does a great job of that, usually swinging with 3 toughness on turn 3.
Boon Satyr Another good way of pushing through courser early and a great late game draw as a combat trick. In trying to be faster, I think it's obvious why I picked him over courser.
Fanatic of Xenagos This guy is extremely under played. Either mode of him is powerful. He's yet another way of pushing through courser.
Ashcloud Phoenix Another really underrated card. A lot of decks have trouble dealing with fliers and it forces specific answers out of your opponent or gets a two for one.
Stormbreathe-dragon I chose him over Sarkhan due to him being more aggressive, I don't want to be wasting time protecting Sarkhan. Like Phoenix, it capitalizes on weakness to fliers and with pro white forces specific answers
Chandra, Pyromaster The ultimate will nearly never happen, so it's usually not worth trying. Both the +1 and 0 are powerful and useful for finishing out a game
Lightning Strike Adds some extra reach and helps deal with sligh and u/w heroic
Magma Jet Like mentioned earlier, I really don't want to be drawing mana late, and this is a way of digging to threats
Arc Lightning This was in the side but decided it was worth maining. Worst case, it's a slightly worse 5th strike, but most matchups it ends up better than that. Obviously good against faster decks but can help clear out some bees as well
Fated Conflagration Another card that started in the board and was in some number bumped to main. It's almost never dead, as it can answer any walker and just about any creature. Biggest use is clearing out rhinos
Now for the Sideboard
Fated Conflagration I wanted access to all 4 copies, mostly for against Abzan, but comes in in a decent amount of matchups
Burn Away This card has been great for me, coming in to clear out larger creatures and deal with the increasing number of reanimator decks.
Anger of the Gods This was an obvious choice as a way to clear out small creature decks including sligh and Jeskai
Magma Spray This was originally Searing Blood but turned into this to deal with speed a little bit better.
Reclamation Sage Useful in a number of matchups, mostly anything green and the combo decks
Firedrinker Satyr This card looks a little out of place, but is great against the increasing number of control lists as a way to get started early
Hornet Nest Good against both aggro and midrange. Drops and just stops all ground attacks