Esper Miracles players are always on a lookout for cheap effects that can help them set up Miracle turns. If you wonder how to deal with the opponent's pick, then just use Thoughtscour to mill them, and the problem is solved.
Scheming Symmetry will most likely see play in Ad Nauseam and Lantern Control decks, too. The Tutor effect is just too powerful and too valuable to pass up here.
All these combos look really tempting, but there is one that will be especially good. It involves Archive Trap in a Mill shell, which can lead to some very spicy brews in Modern.