Blood Tribute

Oracle Text

Kicker—Tap an untapped Vampire you control. (You may tap a Vampire you control in addition to any other costs as you cast this spell.)

Target opponent loses half their life, rounded up. If this spell was kicked, you gain life equal to the life lost this way.

Card Rulings

10/1/2009 You can tap a creature that hasn’t been under your control since your most recent turn began to pay the kicker cost.