last time i remember using burn at the stake it was more of a mono red storm deck during the scars/Inn block. it mostly used the same idea but it focused on using kuldotha rebirth as the token makers and used reforge the soul and past in flames to keep the combo going until the peak amount of goblin...

For modern I would recommend a mono red trading post deck.

trading post, wellsprings, and solemn for card advantage.
slagstorm & magmaquake for boardwipes.
galvanic blast and shrine of burning rage for removal or finisher
kuldotha phoenix as a win-con.

Firemind is definitely better than dracogenius. Having half a combo piece in your command zone is one of the most powerful thing in commander. Not only that, but just building a Firemind deck with windmill effects can cause a massive amount of damage. That being said, Firemind is also paints a much ...

no proxy build from your cards, all that's needed is basics

http://deckstats.net/deck-5183600-fa14a ... 7eb3a.html

main idea is to drop narset with protection and beat face