Text (VI+errata): As an additional cost to cast ~this~, sacrifice a creature. ; Target creature gets +4/+2 until end of turn. [Oracle 2009/07/08]
The sacrifice of a creature 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]
