This is the exact same mirror as our own list, so the sideboard plan mirrors the strategy for matchup 78700: lean into card advantage and disruption. Professor Dellian Fel's card draw and removal mode both overperform in this grindy mirror, while Duress preemptively takes their key sacrifice payoffs or removal spells. Fanatical Offering and the extra Vinereap Mentor Food tokens are too low-impact when both players have identical sacrifice synergies to fight over. Focus games around resolving Rottenmouth Viper and protecting Obsessive Pursuit to out-grind the mirror.

Izzet Spellementals wants to chain cheap spells like Opt, Sleight of Hand, and Prismari Charm to grow Hearth Elemental and Eddymurk Crab, so Duress proactively strips a key piece before it can generate value. The Ooze exiles a card from a graveyard, which slows down Hearth Elemental's cost reduction from instants and sorceries in the graveyard while also building toward our own Mutagen tokens. Requiting Hex is weaker here since Eddymurk Crab (mana value 7) and Hearth Elemental (mana value 6) both dodge its mana value 2 or less restriction, and Fanatical Offering doesn't interact with their game plan of racing through card selection. Focus on proactive disruption of their engine rather than reactive removal that often misses their key threats.

Mono-Green Landfall wants to ramp into Mossborn Hydra and Mightform Harmonizer, so Duress can strip a key enabler like Earthbender Ascension or Glimpse the Core before it snowballs their board. Guerrilla Gorilla's reach and ability to sacrifice itself to destroy a noncreature artifact or enchantment gives us a clean answer to problematic permanents like Earthbender Ascension or Sapling Nursery. Fanatical Offering is too slow against a proactive ramp deck that just wants to curve into bigger threats, and Deadly Precision's extra cost is often awkward when we need efficient answers on curve. Trade removal-heavy slots for proactive disruption and a body that blocks well against their ground creatures.