In terms of Modern, Burn has funnily enough been a deck that I have never played at a major tournament before, yet it is the deck that I have played the most of after Dredge, as it was my second-choice deck for three major tournaments (Pro Tour Oath of the Gatewatch, Pro Tour Rivals of Ixalan and Grand Prix Brisbane)
Obviously, you dont want to be sacrificing your best artifact or creature to Deadly Dispute, but if you sacrifice something small, its usually worth it
Play Boosters are going to tinker with what exactly can be on The List
Channeled Dragonfire yeah, this card is pretty terrible, but the front side is at least reasonable, even if sorcery speed
This archetype is about synergy, most six drops win by themselves
Otherwise, drop me a tweet at @bradleyrose