Mono-Green Eldrazi grinds with Sowing Mycospawn and Kozilek's Command while building toward Emrakul, the Promised End, so extra Tormod's Crypt denies graveyard card types that reduce Emrakul's cost and strips value from Icetill Explorer's graveyard-land plan. Unholy Heat answers Eldrazi Spawn tokens, and with our own graveyard growing it can scale to 6 damage against threats like Writhing Chrysalis or Herigast, Erupting Nullkite. Nature's Claim is a cheap answer to Utopia Sprawl-fueled mana acceleration or any problematic artifact/enchantment they land. We trim slow utility pieces for a mix of graveyard disruption and removal suited to this grindier green matchup.

This is a grindy artifact-lands race where Ancient Stirrings, Urza's Saga, and Malevolent Rumble fuel their Eldrazi threats, so extra Tormod's Crypt slows their Emrakul, the Promised End (whose cost reduction relies on graveyard card types). Veil of Summer is still useful as protection, making our spells uncounterable for the turn and giving us and our permanents hexproof from blue and black, which is relevant if their sideboard brings in blue or black interaction. Nature's Claim answers Blade of the Bloodchief or a resolved artifact threat cheaply. We already have Haywire Mite in the 75 as an extra artifact/enchantment answer, so we trim redundant utility (Boomerang Basics, Sewer-veillance Cam, Grinding Station, Haywire Mite, Six) that does little against their board-based plan.

Izzet Prowess is a fast clock built on cheap creatures like Dragon's Rage Channeler, Monastery Swiftspear, and Slickshot Show-Off, so we need efficient removal rather than more card selection. Unholy Heat kills any of their one- or two-toughness threats for a single mana, and Fire Magic's Fira mode for {2}{R} sweeps their whole token/prowess board at instant speed. Hurkyl's Recall is mostly a backup artifact bounce but can reset our own Mox Amber/Mox Opal if they try to Meltdown us, though its main job here is just an efficient cheap spell; prioritize the removal. We cut slower, non-interactive pieces since this matchup is about surviving to turn 4-5 rather than grinding.