Boros Energy swarms the board with Ragavan, Ocelot Pride's Cat tokens, Guide of Souls, and Voice of Victory's Warrior tokens, making Brotherhood's End's 3 damage to each creature and planeswalker a great sweeper against their low-toughness aggressive plan (it also hits Ajani, Nacatl Pariah's planeswalker side and Seasoned Pyromancer's Elemental tokens). Reprieve lets you buy a turn by returning a spell they cast, such as Galvanic Discharge or a key creature, to their hand, while also drawing you a card. It can't answer Goblin Bombardment's sacrifice ability, since that is an activated ability and not a spell, and it is harder to use on their turn while Voice of Victory is out. Keep Pawpatch Formation in, because they run several enchantments worth destroying, including Blood Moon, Goblin Bombardment, and Static Prison. Instead, cut the seven-mana Raph & Mikey, one Prismatic Ending, and Valakut Awakening, since you need proactive sweeping power more than slow cards against this fast clock. Keep your Leyline Binding and Teferi, Time Raveler as premium ways to answer their best threats and to restrict them to casting spells at sorcery speed.