While resolving Torment of Venom, the creatureâ€™s controller chooses a card to be discarded without revealing it, chooses a nonland permanent to be sacrificed, or chooses to do neither. Then that player discards that card, sacrifices that permanent, or loses 3 life. That player can always choose to lose 3 life, even if they have cards to discard or nonland permanents to sacrifice.
If the target creature is an illegal target by the time Torment of Venom resolves, the entire spell doesnâ€™t resolve. The creatureâ€™s controller wonâ€™t be tormented.
Because state-based actions arenâ€™t performed while Torment of Venom is resolving, the target creature is still on the battlefield while its controller is tormented. If that creature has an Aura attached to it, that Aura can be sacrificed.
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