Retraction Helix

The trick here is that the granted ability is a tap ability, not a one-shot spell effect, and that distinction is the whole engine. Bestowing ": Return target nonland permanent to its owner's hand" onto a creature with an untap source turns a single blue instant into a repeatable bounce loop: any way to untap the holder (a creature that untaps on a trigger, an instant that untaps it, a permanent that does so) lets you fire the activation again before end of turn. The bounce reads "nonland permanent," wide enough to pick up your own artifacts and enchantments for value or to strip an opponent's board down to nothing. The catch is that an activated ability belongs to whoever controls the permanent it sits on, so this only ever wants to land on a creature you control: granting it to an opposing creature simply hands your opponent a bounce ability, which they will either ignore or aim back at you. The single-blue cost keeps it honest; the effect does nothing without a tap engine to feed, which is exactly the kind of conditional, ceiling-over-floor design that separates a build-around enabler from a maindeck staple. As combo glue it does the work a sorcery-speed enabler cannot, slipping in at instant speed to set up an end-of-turn lock or to answer a threat at the worst possible moment for its owner.