Vengeful Strangler can't block
When Vengeful Strangler dies, return it to the battlefield transformed under your control attacked to target creature or planeswalker an opponent controls.
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Strangling Grasp
Enchant creature or planeswalker an opponent controls
At the beginning of your upkeep, enchanted permanent's controller sacrifices a nonland permanent and loses 1 life.
This creature can't block.
When this creature dies, return it to the battlefield transformed under your control attached to target creature or planeswalker an opponent controls.
Enchant creature or planeswalker an opponent controls
At the beginning of your upkeep, enchanted permanent's controller sacrifices a nonland permanent of their choice, then that player loses 1 life.
