Forbidden Ritual

Oracle Text

Sacrifice a nontoken permanent. If you do, target opponent loses 2 life unless that player sacrifices a permanent or discards a card. You may repeat this process any number of times.

Card Rulings

10/4/2004 If you choose to repeat the process, you repeat the effect but do not get to pick a different target opponent.
10/4/2004 You choose the target opponent on casting.
10/4/2004 You sacrifice during resolution, not during casting.