Volcanic Vision
Sorcery
Return target instant or sorcery card from your graveyard to your hand. Volcanic Vision deals damage equal to that card's converted mana cost to each creature your opponents control. Exile Volcanic Vision.
Illustrated by
Dragons of Tarkir#167RareEnglishLegality
Rulings
Feb 25, 2015
If the target instant or sorcery card becomes an illegal target before Volcanic Vision resolves, the spell won’t resolve and none of its effects will happen. No damage will be dealt and Volcanic Vision won’t be exiled.
Feb 25, 2015
If the target has 
in its mana cost, X is 0.