This matchup is a long grind against a colorless-heavy ramp deck that wants to land Emrakul, the Promised End or Devourer of Destiny and buries you in card advantage with Kozilek's Command. Obsidian Charmaw is cheap, since its cost reduces for each of their colorless-producing lands, and it gives you a flying clock while blowing up Urza's Saga, Eldrazi Temple, or Ugin's Labyrinth on entry. Rest in Peace shuts off Malevolent Rumble's graveyard filling and prevents any graveyard value. Stubborn Denial can only counter noncreature spells, and most of their key threats (Emrakul, Devourer of Destiny, Sowing Mycospawn, Basking Broodscale) are creatures, so all three copies get trimmed for proactive hate.