This matchup is a race against their colorless artifact/Eldrazi engine backed by Urza's Saga and Blade of the Bloodchief; Force of Vigor blows up their Agatha's Soul Cauldron-style engines like Blade of the Bloodchief and can also hit an Urza's Saga Construct token before it grows huge. Endurance strips their graveyard of value from Malevolent Rumble while flashing in as a blocker against Glaring Fleshraker. Abrupt Decay is clean, uncounterable removal for Basking Broodscale or Blade of the Bloodchief before it snowballs. Trim slower or clunkier cards like Formidable Speaker and a couple Walking Ballistas since we want to be proactive and disruptive rather than grindy against their go-wide Eldrazi Spawn plan.

Izzet Prowess is an aggressive tempo deck reliant on cheap, free-ish spells (Mutagenic Growth) and burn like Lightning Bolt to close games fast, so Vexing Bauble is excellent since Mutagenic Growth costs no mana and gets outright countered. Abrupt Decay is a clean answer to Dragon's Rage Channeler or Monastery Swiftspear that dodges their limited counterplay. Cut Formidable Speaker and Dredger's Insight since they're too slow against a deck that wants to kill us by turn 4-5 with burn to the face; we need to prioritize cheap interaction and blockers. Keep Orcish Bowmasters in since it punishes their card-draw spells like Preordain, which has them draw an extra card off the top.

Esper Blink leans on cheap interaction (Solitude, Fatal Push, Thoughtseize) and value creatures like Phelia and Overlord of the Balemurk, so proactive discard from Thoughtseize helps strip their removal or a key blink piece before we commit our own threats. We're cutting Underground Mortuary to reduce reliance on a tapped land against their proactive discard-heavy start, and Dredger's Insight is weaker here since it doesn't meaningfully disrupt their plan. Keep the core Yawgmoth engine intact since they have limited hard removal for our resilient threats beyond Solitude and Fatal Push.