Sorcery, XR (1) Demonfire deals X damage to target creature or player. If a creature dealt damage this way would be put into a graveyard this turn, remove it from the game instead. Hellbent - If you have no cards in hand, Demonfire can't be countered by spells or abilities and the damage can't be prevented.1
Illus. Greg Staples
The Hellbent ability checks how many cards you have in hand when this spell resolves. If this is the last card in your hand and you play it, you will not have it in your hand when this resolves. [D'Angelo 2006/09/30]