Bane's Realm

Extort {b/r} (Whenever you cast a spell, you may pay {b/r}. If you do, each opponent loses 1 life and you gain that much life.)
As long as Bane's realm is on the battlefield, creatures your opponents control come into play tapped.
The Realm of Red, the Plane of Power, the Prison of Infidels and the Unworthy.