burn deck, but I don't understand some of your choices, why put the vampire? if I were you I would play the goblin guide! and would play: Shard Volley , Lava Spike , Rift Bolt in place of Searing Spear , Incinerate and shock.another interesting card for your type of deck is Volcanic Fallout if you should take a look at my deck! ;) ----> Goblins In Arms!

Miracle...its dangerous, may come on your opening hand. Put volcanic fallout or flamestrike

I like the Noxious Revival + Thunderous Wrath /Bonfire of the Damned combination.

Shock , Searing Spear , Brimstone Volley and Incinerate are less efficient than what is expected in Modern, however.As krenkocapocosca said, Lava Spike and Rift Bolt are excellent replacements in a burn deck. In a burn deck, all you care about is counting to 20 as fast as possible. I would try and cram as many 3-damage 1cmc spells in here as possible. The Miracle cards are fine as 2-ofs, but I am not sure if Koth of the Hammer is what you want here? Isn't there a version of Chandra that would be directly synergistic with your deck?

Chandra's Phoenix.. in my opinion is sooo slowly, put Hellspark Elemental, Ball Lightning, things of this type. And the miracle combo, really nice , im thinking to use in my burn too