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Enchant creature or planeswalker an opponent controls
At the beginning of your upkeep, enchanted permanent's controller sacrifices a nonland permanent, then that player loses 1 life.
If an effect causes Vengeful Strangler to transform on the battlefield, rather than leaving it and returning transformed, then Strangling Grasp doesn't become attached to any object and is put into your graveyard. This won't cause abilities that trigger when a creature leaves the battlefield to trigger.
