Mono-Green Eldrazi relies heavily on Fight Rigging, an enchantment that hides away a free spell and grows creatures, plus various colorless lands like Eldrazi Temple and Ugin's Labyrinth for ramp, so Force of Vigor is excellent at destroying Fight Rigging for free before it can cheat out a huge threat. Endurance's evoke resets their graveyard against Emrakul, the Promised End's cost reduction and denies value from Malevolent Rumble or Green Sun's Zenith looping through the yard, while also serving as a solid blocker against Fanatic of Rhonas or Slumbering Trudge. We cut the small-target removal (Dead // Gone, Sink into Stupor) since their real threats are huge (Emrakul at 13/13, Ulamog, Drowner of Truth) and untouched by 2 damage or bounce that just delays them a turn. Force of Negation remains vital to stop Emrakul, the Promised End or Ugin, Eye of the Storms from resolving.

This Gruul Eldrazi combo deck relies on Urza's Saga, Ancient Stirrings, and Malevolent Rumble to assemble Basking Broodscale plus Blade of the Bloodchief style value engines, so Force of Vigor is excellent for blowing up Urza's Saga or any artifact engine pieces for free. Endurance's evoke resets their graveyard against Emrakul, the Promised End's cost reduction (which counts card types in graveyard) and denies Malevolent Rumble/Ancient Stirrings recursion value. The extra copy of Wistfulness (cast for GG) can exile a problematic artifact like Urza's Saga or Ugin's Labyrinth while replacing itself, and its evoke mode also lets us discard down for value in a pinch. We cut narrow removal spells that don't answer their large Eldrazi threats (Devourer of Destiny, Emrakul) or their engine lands, favoring disruption that hits their actual game plan.

Izzet Prowess is a low-curve aggressive deck full of 1-2 toughness creatures (Dragon's Rage Channeler, Monastery Swiftspear, Slickshot Show-Off), making Brotherhood's End's 3 damage sweeper mode a great one-sided reset that also hits any Cori-Steel Cutter Monk tokens. We trim Quantum Riddler since its 5-mana body is too slow against their fast clock and its Warp mode leaves us tapped out against a deck full of cheap burn and counters like Consign to Memory. Keep Force of Negation and Subtlety at full count since they're premium against a deck that wants to jam threats and burn us out, and Subtlety can bounce a key Dragon's Rage Channeler or Slickshot Show-Off. Our Crashing Footfalls rhinos and Violent Outburst cascades provide the resilient bodies needed to race and block their small creatures.