Mount Keralia — ruling 1

If you roll {CHAOS}, Mount Keralia’s damage-prevention effect will last for the rest of the game. It will apply to damage dealt by any plane named Mount Keralia, regardless of who owns that plane.

Mount Keralia : règles, fonctionnement et interactions (MTG)

Mount Keralia 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

At the beginning of your end step, put a pressure counter on Mount Keralia. When you planeswalk away from Mount Keralia, it deals damage equal to the number of pressure counters on it to each creature and each planeswalker. Whenever chaos ensues, prevent all damage that planes named Mount Keralia would deal this game to permanents you control.

How it works : Mount Keralia

Original English text — Wizards of the Coast / Scryfall

#1June 1, 2012· Wizards of the Coast
If you roll , Mount Keralia’s damage-prevention effect will last for the rest of the game. It will apply to damage dealt by any plane named Mount Keralia, regardless of who owns that plane.
No other card is named in this ruling.