Tutor for Energy Flux, Rest in Peace, and Stony Silence feel like vintage-quality plays against Workshops, Dredge, and Outcome respectively. It finds both halves of the Time Vault / Voltaic Key combo (or Painter's Servant / Grindstone or Leyline of the Void / Helm of Obedience )
What else can we do with it?
More directly, what relevant plays can we make with an Enlightened Tutor against more controlling decks, like Xerox, BUG, or Landstill. Finding Grafdigger's Cage against Oath feels underwhelming, but serviceable. Finding Sylvan Library feels painfully slow (you don't get to draw any cards for two turns after you cast the tutor).
Are there any artifacts or enchantments in these matchups that are worth losing a card to find them?