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Vengeful Strangler can't block.
When Vengeful Strangler dies, return it to the battlefield transformed under your control attached to target creature or planeswalker an opponent controls.
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.
