Boros Energy floods the board with cheap threats (Ocelot Pride, Ragavan, Guide of Souls) so an additional Wrath of the Skies helps sweep wide boards, while Rest in Peace shuts off graveyard synergies. High Noon slows their low-curve aggression to one spell a turn, buying time for your sweepers. Counterspell and Spell Snare are weak since much of their deck is creatures with mana values that dodge Spell Snare or resolve before you're online, and Day's Undoing is too slow against a proactive aggro clock. Captain Marvel gives a resilient flash blocker/lifelink threat against their go-wide plan.