Grotag Siege-Runner — ruling 1

If the targeted creature is an illegal target by the time the ability resolves, the ability doesn't resolve. Its controller won't be dealt damage.

Grotag Siege-Runner : règles, fonctionnement et interactions (MTG)

Grotag Siege-Runner 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

, Sacrifice this creature: Destroy target creature with defender. This creature deals 2 damage to that creature's controller.

How it works : Grotag Siege-Runner

Original English text — Wizards of the Coast / Scryfall

#1June 15, 2010· Wizards of the Coast
If the targeted creature is an illegal target by the time the ability resolves, the ability doesn't resolve. Its controller won't be dealt damage.
No other card is named in this ruling.