Chandra, Pyromaster is easily the best version of Chandra, and is being reprinted in M15!
To quickly recap her abilities, the 0 tends to be the most relevant:
O: Exile the top card of your library. You may play it this turn.
Essentially, she is used as a red draw engine, though you need to keep mana open if you plan on using her. The rest of the time, you just throw one damage at a creature and player and make it so they cannot block.
Until next time,