If the enchanted creature leaves the battlefield in response to the triggered ability but the Aura is still on the battlefield, the Aura will be put into its owner's graveyard as a state-based action
That's some solid versatility for such an unusual effect in this color pair, and even though it only has one printing, you can get it for about a quarter
It's low cost and versatility makes it a powerful card for black/green decks in particular
It is, nonetheless, a very very good play that most people would not have found unless they were explicitly exposed to it before, and even then they might not have found it (the casters didnt, for example, though they were quick to catch onto it as it happened)
Orim's Chant (Ext, S) One of the essential elements of a combo deck is a way to get the combo through against countermagic