Text (6th+errata): Prevent the next 5 damage that would be dealt this turn to any number of target creatures and/or players, divided as you choose. [Oracle 2000/10/24]
You choose the targets and you choose how to divide up the 5 damage on announcement. [WotC Rules Team 2000/04/26]
You cannot choose zero targets. You must choose between 1 and 5 targets. [DeLaney 2003/05/19]
