I have 2 Chandra's in my deck just because you can discard Lava axes and use her final ability. Reverberate
is also a nice card to have in a burn
deck because lava axe
then does 10 dmg, or 5 to the player and 5 to a creature, however you decide. Some flame servants might be helpful also for the double damage to red sorcery spells.
Also add Chandra's Spitfire
, pretty cheap to bring out and the effect counts for each red sorcery you use. so they have the to be 10/3's with flying if you play your cards right.