Energy Field

Oracle Text

Prevent all damage that would be dealt to you by sources you don't control.

When a card is put into your graveyard from anywhere, sacrifice Energy Field.

Card Rulings

10/4/2004 Buyback causes a spell to go to your hand instead of your graveyard, so using Buyback will avoid triggering this card to be sacrificed.
10/4/2004 Discarding does trigger this.