Gruul Basking Broodscale Combo relies heavily on artifact/land engines (Urza's Saga, Eldrazi Temple, Walking Ballista, Blade of the Bloodchief) to enable Basking Broodscale's discard-a-card triggers, so Force of Vigor is a free two-for-one that can blow up their Saga or a key artifact at no mana cost. Brotherhood's End's overload sweeps their small permanents and artifacts, which can meaningfully set back their engine before they chain into Emrakul, the Promised End. Cut Oliphaunt and Sink into Stupor since they don't interact with the opponent's game plan and you need proactive disruption instead. Try to race with your own Living End flip since their deck, while resilient, isn't particularly fast at pressuring your life total early.

Izzet Prowess is a low-curve tempo-aggro deck that goes wide with cheap threats like Dragon's Rage Channeler and Monastery Swiftspear, so Brotherhood's End's overload mode is a one-sided board wipe that can completely blow them out after they've committed their hand. Mystical Dispute is excellent since it's a hard counter against a mono-blue-adjacent deck full of cantrips and can stop a Cori-Steel Cutter or Expressive Iteration cheaply. Trim your top-end (Waker of Waves, Oliphaunt) since they're too slow and clunky against a deck trying to kill you by turn 4-5. Race carefully — Street Wraith and Wistfulness help you dig for interaction and threats quickly enough to survive their early clock.

Affinity floods the board with cheap artifact creatures like Kappa Cannoneer, Arcbound Ravager, and various golems off Urza's Saga, so Force of Vigor is a two-for-one blowout that can pitch a card to destroy two artifacts (or wreck their Saga chapter III token and another permanent) for free. Inevitable Betrayal lets you steal a threat like Kappa Cannoneer or an animated Saga construct and swing back with it, which is huge tempo against a deck that can't easily remove your board. Force of Negation gets trimmed since Affinity has few must-counter spells early and you'd rather deploy your own plan; Sink into Stupor is too slow to matter against their explosive draws. Focus on flipping Living End to answer their go-wide boards in one shot, since your creatures individually are usually smaller than theirs.