Thrull Parasite

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
{T}, Pay 2 life: Remove a counter from target nonland permanent.

Flavor Text: The hunger of a vampire and the subtlety of a tax collector.

Card Details:
Set: The List
Collector Number: GTC-81
Artist: Clint Cearley