Mono-Green Eldrazi wants to ramp into huge threats like Emrakul and Ulamog, so racing them before they stabilize is critical. Unholy Heat with delirium easily kills their early blockers like Fanatic of Rhonas or Disciple of Freyalise, keeping your clock alive. Consign to Memory provides key interaction against colorless spells like Sowing Mycospawn or Kozilek's Command as well as high-impact triggered abilities. Trim slow combat tricks for interaction that keeps their threats in check.

This is a race against a deck assembling an Eldrazi ramp/combo shell, so speed and removal for their early blockers matter most. Unholy Heat kills Basking Broodscale, Glaring Fleshraker, and other small Eldrazi bodies cleanly, and reaches delirium fast in this deck to threaten bigger things. Meltdown answers their artifacts and Urza's Saga tokens if they go that route, though its main value here is hitting cheap artifacts that get in the way. Combat tricks are less relevant since this matchup is decided by who deploys threats and removes blockers first, not combat math.

This is a mirror-style race where efficient removal and disruption matter more than pure aggression. Unholy Heat cleanly answers their Dragon's Rage Channeler and Monastery Swiftspear, and easily hits 6 damage off delirium to kill Slickshot Show-Off. Meltdown blows up their Cori-Steel Cutter, Mishra's Bauble, and Mox-style artifacts (well, they have none, but it hits Cutter and Bauble) while Spell Pierce protects your key spells or stops theirs. Mutagenic Growth and Violent Urge are too narrow when both sides are trading removal; cut some combat tricks for interaction that actually removes their threats.