Blind Obedience - 1030 R SLD

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.)
Artifacts and creatures your opponents control enter tapped.
"Man is a beast and it is good that fear fills him."
—Nagash, Supreme Lord of the Undead
rare
Enchantment
From the Magic: The Gathering set Secret Lair Drop.