Glacial Chasm
Land
Cumulative upkeep—Pay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When Glacial Chasm enters the battlefield, sacrifice a land.
Creatures you control can't attack.
Prevent all damage that would be dealt to you.
Illustrated by
From the Vault: Realms#7MythicEnglishLegality
Rulings
Aug 1, 2008
When Glacial Chasm’s enters-the-battlefield ability resolves, if you don’t control any other lands, you must sacrifice Glacial Chasm itself.