Survival Elves relies on mana dorks like Birds of Paradise, Llanowar Elves, and Fyndhorn Elves to power out Survival of the Fittest and Gaea's Cradle, so Nausea's -1/-1 sweeps most of their early mana base and small creatures. Diabolic Edict answers their single big threat when they've built toward one, especially useful against Deranged Hermit's squirrel tokens or a lone Masticore. Sickening Dreams is cut since discarding cards while they're also disrupting your mana via Wasteland-style effects is too risky, and Peek gives little actionable information here. Keep Duress in to strip Survival of the Fittest before it starts generating value.