Text (PS+errata): 1/1. ; When ~this~ enters the battlefield, you gain 2 life for each black and/or red creature target opponent controls. [Oracle 2009/07/08]
If a creature is both black and red, you gain 2 life, not 4. [Planeshift FAQ 2001/01/26]
Note - This card was creature type "Soldier" until Oracle 2007/10/01, when it became "Human Soldier Scout".