This matchup is a race and an artifact/enchantment battle: their manabase is full of colorless value lands (Eldrazi Temple, Ugin's Labyrinth) alongside Urza's Saga, which is an enchantment land, so Force of Vigor can target Saga as well as Blade of the Bloodchief or a stray Vexing Bauble. Masked Vandal gives another body that can exile a problem artifact on entry while advancing our board. Keep Haywire Mite in mind but it's low impact here since their key threats (Devourer of Destiny, Emrakul) aren't artifacts or enchantments. Prioritize going under them with Cauldron Familiar/Carrion Feeder loops before they assemble Devourer of Destiny plus Kozilek's Command lockout.

Izzet Prowess is a fast aggro-tempo deck with mostly 1-2 mana threats, and Witherbloom Charm's mode to destroy a nonland permanent with mana value 2 or less picks off Monastery Swiftspear, Dragon's Rage Channeler, or a Cori-Steel Cutter equipment cheaply while we develop our board. Our own low curve and lifegain from Gilded Goose/Cauldron Familiar helps race their burn plan. Explosive Prodigy is a low-impact removal spell here since its damage output depends on our color count and isn't reliably lethal to their bigger threats like Slickshot Show-Off once pumped. Keep the rest of the build intact since our clock via Carrion Feeder/Ajani transformations is typically faster than their damage output if we stabilize past turn 3.

Affinity is an artifact-dense deck (Mox Opal, Urza's Saga, Weapons Manufacturing, Kappa Cannoneer), making Force of Vigor's ability to destroy up to two artifacts and/or enchantments a huge tempo and card advantage swing, especially against Urza's Saga or a key Mox Opal. Masked Vandal provides another artifact answer on entry while blocking their small creatures. Vexing Bauble counters spells cast if no mana was spent to cast them, so it is most relevant against their Mox Opal, Welding Jar, and other zero-cost artifacts. We trim our weakest, most artifact-agnostic slots (Explosive Prodigy, Sylvan Safekeeper, one Young Wolf, one Dryad Arbor for a nonland) since our own graveyard/sacrifice plan is largely unaffected by their removal-light, artifact-focused gameplan.