Jeskai Energy fields a low-curve, creature-dense board (Ragavan, Nimble Pilferer, Ocelot Pride, Guide of Souls, Ajani, Nacatl Pariah), so Brotherhood's End's 3-damage sweep cleanly answers most of their early threats at once. Teferi, Time Raveler shuts off Solitude's flash and their instant-speed Galvanic Discharge or Thraben Charm on our turn, while also being able to bounce a sticky Ajani, Nacatl Pariah. Force of Negation is only live against a handful of their noncreature spells (Goblin Bombardment, Thraben Charm), so trim some copies for the sweeper and planeswalker. Keep the full core engine and prioritize stabilizing the board before resolving Living End, since their deck can go wide quickly.