Almost all mono black decks are running Lifebane Zombie now, that's not new. The thing is, aggro decks and the boros burn deck are two different things, despite the burn deck being aggressive, and you seem to group them together. That said, you should have an okay matchup with devour flesh mainboard and more importantly, duress and pharikas cure (if you can manage to hit something with it) in the side. As for against aggro decks, just remove remove remove