Sorcery, 1B (2) As an additional cost to play Infernal Harvest, return X Swamps you control to their owner's hand. Infernal Harvest deals X damage divided as you choose among any number of target creatures.1 "I offered you eternal life; I just didn't say where." -Shauku, Endbringer
Illus. Nathalie Hertz
The return of X of your Swamps to your hand is part of the play cost and is paid on announcement. You do not have a choice to pay this cost zero times or more than one time in order to multiply the effect. [D'Angelo 1997/01/28]
You can use X as being zero. [bethmo 1997/02/25]
If X is greater than zero, you cannot choose zero targets. You must choose between 1 and X targets. If X is zero, you cannot choose any targets. [DeLaney 2003/05/19]