Historical Rules · 16 July 2010
Rule 901.9a
Official source text from the 16 July 2010 Rules release
If a plane leaves the game while a "planeswalking ability" for which it was the source is on the stack, that ability ceases to exist.
Historical Rules · 16 July 2010
Official source text from the 16 July 2010 Rules release
If a plane leaves the game while a "planeswalking ability" for which it was the source is on the stack, that ability ceases to exist.