Boros Aggro is full of red and white creatures, so Terminal Criticism cleanly answers Magmatic Hellkite, Nova Hellkite, and Smaug the Magnificent (all red) while gaining life to offset their fast clock. Qarsi Revenant's flying deathtouch lifelink body is a great blocker against their aggressive fliers, and the extra Requiting Hex picks off their cheap creatures like Momo, Friendly Flier and Voice of Victory. Duress is weak since we need to stabilize the board rather than attack their hand against a low-curve aggro deck, and Thror's Map and Demolition Field are cut since we need maximum interaction, not fixing or land disruption, in a race.