The next day, the executioner was found with ashen handprints on his throat.

Vengeful Strangler // Strangling Grasp

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.

As the flames consumed the killer, his eyes remained fixed on the executioner's face, his hands twitching like angry spiders.

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.

Innistrad: Double Feature

Innistrad: Midnight Hunt

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.