Magic: The Gathering Comprehensive Rules Changes - Eventide to Shards of Alara

Old rule (Eventide)	New rule (Shards of Alara)
420.6. [Click to view all changes.]
	420.6. If multiple state-based effects would have the same result at the same time, a single replacement effect will replace all of them. Example: You control Lich's Mirror, which says "If you would lose the game, instead shuffle your hand, your graveyard, and all permanents you own into your library, then draw seven cards and your life total becomes 20." There's one card in your library and your life total is 1. A spell causes you to draw two cards and lose 2 life. The next time state-based effects are checked, you'd lose the game due to rule 420.5a and rule 420.5g. Instead, Lich's Mirror replaces that game loss and you keep playing.

Old rule (Eventide)

New rule (Shards of Alara)

420.6.

If multiple state-based effects would have the same result at the same time, a single replacement effect will replace all of them.

Example: You control Lich's Mirror, which says "If you would lose the game, instead shuffle your hand, your graveyard, and all permanents you own into your library, then draw seven cards and your life total becomes 20." There's one card in your library and your life total is 1. A spell causes you to draw two cards and lose 2 life. The next time state-based effects are checked, you'd lose the game due to rule 420.5a and rule 420.5g. Instead, Lich's Mirror replaces that game loss and you keep playing.