Predatory Wurm — ruling 1

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Predatory Wurm may become lethal if you controlled a Garruk planeswalker and he leaves the battlefield during that turn.

Predatory Wurm : règles, fonctionnement et interactions (MTG)

Predatory Wurm 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

Vigilance (Attacking doesn't cause this creature to tap.) This creature gets +2/+2 as long as you control a Garruk planeswalker.

How it works : Predatory Wurm

Original English text — Wizards of the Coast / Scryfall

#1June 23, 2020· Wizards of the Coast
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Predatory Wurm may become lethal if you controlled a Garruk planeswalker and he leaves the battlefield during that turn.
No other card is named in this ruling.