This opponent relies on nonbasic lands (Eldrazi Temple, Ugin's Labyrinth, Urza's Saga, Cavern of Souls) and colorless ramp to power out Emrakul or an army of Eldrazi Spawn tokens, so Magus of the Moon turning their nonbasics into Mountains is devastating. Obsidian Charmaw gets cheap against their colorless-heavy manabase and can blow up a key nonbasic land like Urza's Saga or Eldrazi Temple while adding a flying clock. Brotherhood's End's second mode cleans up cheap artifact tokens/Blade of the Bloodchief. Orcish Bowmasters is weaker here since it doesn't interact with their big threats or lands, and the sacrifice payoffs are lower priority than disruption in a grindy ramp matchup.

Izzet Prowess floods the board with cheap threats like Monastery Swiftspear, Dragon's Rage Channeler, and Slickshot Show-Off, so Brotherhood's End as a sweeper dealing 3 damage to each creature is excellent, and Engineered Explosives cleanly answers their glut of cheap permanents including Mishra's Bauble and Cori-Steel Cutter. Village Rites and Corrupted Conviction are sacrifice-based card draw that are too slow and reactive against an aggressive tempo deck, so they come out; one copy of Rakdos Charm also comes out since its graveyard exile and artifact destruction modes are lower impact here while the remaining copy stays for its damage-to-controller mode which can help close games. Keep the full removal suite of Lightning Bolt and Fatal Push, as both efficiently kill their key one and two drops. Orcish Bowmasters remains excellent, punishing their card draw from Preordain while blocking profitably.

Esper Blink is a fair, removal- and value-heavy deck with Thoughtseize, Solitude, and Orcish Bowmasters, so our sideboard has few clean answers; this is mostly about sequencing around their interaction. The extra Rakdos Charm gives another instant-speed answer, either destroying an artifact or exiling their graveyard to blunt Emperor of Bones' recursion and any escape/flashback lines. Village Rites comes out since sacrificing a creature for cards is risky against their efficient removal suite (Fatal Push, Solitude) that can strip our board first. Keep the rest of the core intact since this matchup is decided by card quality and tempo, not by any sideboard silver bullet.