Survival Elves leans on Survival of the Fittest to tutor up threats and Gaea's Cradle for explosive mana, so Meddling Mage naming Survival of the Fittest can completely shut down their engine. Seal of Cleansing answers Survival of the Fittest or an Armageddon-enabling piece before it takes over the game, and is a clean two-for-one against their enchantment-light but Survival-dependent shell. Mana Leak is inconsistent against their ramp (Birds of Paradise, Llanowar Elves, Gaea's Cradle) letting them play around it, so we trim some copies along with Intuition for more proactive disruption. Swords to Plowshares and Parallax Wave handle their creature threats like Deranged Hermit and Ravenous Baloth efficiently.