I like fairly low power items that are just simple and useful. I know you probably don't believe me, given some of the epic items I post up here, but honest, it's true. This is a good example of such a thing - gives a nice ability a fairly generous number of times, but is unlikely to break the game.
AMULET OF BLADE WARD
Uncommon Amulet (Requires Attunement)
The wearer of this amulet may, as a bonus action, cast the Blade Ward cantrip up to 5x/long rest.