So, the combo is using Burning-Tree Emissary , Heritage Druid +Nettle Sentinel combo, and Cloudstone Curio to cast a lot of creatures for Purphoros, God of the Forge to deal tons of damage and then cast a giant Grapeshot ?

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Elvish Promenade

That's essentially how it run's, but I really don't want to keep elves in this deck. This is somewhat of a test run to find out how to make my main combo work well. Elves just make it a rather easy engine to build upon.

Also not a fan of Elvish Promenade in this deck, the deck likes to play and drop cheap creatures constantly. 4 mana to drop creatures that can't come back to my hand feel's like wasted potential. Might test it as a 1 of though.