Worldfire | Magic: The Gathering
Formats Worldfire is Legal in
Official Oracle Text for Worldfire
Official Rulings for Worldfire
7/1/2012 : If your life total is greater than 1 when Worldfire resolves, the change in life total will count as life loss. Other effects that interact with life loss will interact with this effect accordingly.
7/1/2012 : Worldfire won't be exiled. It will go to your graveyard as the final part of its resolution.