Text (FS+errata): Kicker {R}. ; If ~this~ was kicked, it has split second. ; ~this~ deals X damage to each creature without flying and each player. [Oracle 2009/10/11]
If cast with X equal to zero, no player or creature is damaged by it. [D'Angelo 2007/05/15]
If the Kicker cost is paid, it has split second as long as it is on the stack. [Future Sight FAQ 2007/05/01]