Vengeful Strangler // Strangling Grasp — ruling 1

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.

Vengeful Strangler // Strangling Grasp : règles, fonctionnement et interactions (MTG)

Vengeful Strangler // Strangling Grasp is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

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.

How it works : Vengeful Strangler // Strangling Grasp

Original English text — Wizards of the Coast / Scryfall

#1September 24, 2021· Wizards of the Coast
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.
No other card is named in this ruling.