"Magic 2013", +m/le(ft|aves?)\sthe\sbattlefield/, +!champion, +!revolt, +!unearth (2)
When Oblivion Ring enters, exile another target nonland permanent.
When Oblivion Ring leaves the battlefield, return the exiled card to the battlefield under its owner's control.
When Thragtusk enters, you gain 5 life.
When Thragtusk leaves the battlefield, create a 3/3 green Beast creature token.
Gatherer works better in the Companion app!