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Magic: The Gathering Comprehensive Rules Changes

Masters Edition to Lorwyn (Single Change View)

General changes

Old rule (Masters Edition) New rule (Lorwyn)

419.8a.

Some effects apply to damage from a source-for example, "The next time a red source of your choice would deal damage to you this turn, prevent that damage." If an effect requires a player to choose a source, he or she may choose a permanent, a spell on the stack (including an artifact, creature, or enchantment spell), or any card or permanent referred to by an object on the stack (including a creature that assigned combat damage on the stack, even if the creature is no longer in play or is no longer a creature). The source is chosen when the effect is created. If the player chooses a permanent, the prevention will apply to the next damage from that permanent, regardless of whether it's from one of that permanent's abilities or combat damage dealt by it. If the player chooses an artifact, creature, or enchantment spell, the prevention will apply to any damage from that spell and from the permanent that it becomes when it resolves.

419.8a.

Some effects apply to damage from a source-for example, "The next time a red source of your choice would deal damage to you this turn, prevent that damage." If an effect requires a player to choose a source, he or she may choose a permanent; a spell on the stack (including an artifact, creature, enchantment, planeswalker spell); any card or permanent referred to by an object on the stack; or a creature that assigned combat damage on the stack, even if the creature is no longer in play or is no longer a creature. The source is chosen when the effect is created. If the player chooses a permanent, the prevention will apply to the next damage from that permanent, regardless of whether it's from one of that permanent's abilities or combat damage dealt by it. If the player chooses an artifact, creature, enchantment, planeswalker spell, the prevention will apply to any damage from that spell and from the permanent that it becomes when it resolves.