Magic: The Gathering Comprehensive Rules Changes - Core Set - Ninth Edition to Ravnica: City of Guilds

Old rule (Core Set - Ninth Edition)	New rule (Ravnica: City of Guilds)
308.1. [Click to view all changes.]
308.1. As the declare attackers step begins, the active player declares attackers (this game action doesn't use the stack). If the game allows the active player to attack multiple other players, he or she declares which player each creature is attacking. Effects from a creature that refer to a defending player refer only to the defending player it is attacking. Then any abilities that triggered on attackers being declared go on the stack. (See rule 410, "Handling Triggered Abilities.") Then the active player gets priority and players may play spells and abilities. Example: Tanglewalker reads, "Creatures you control are unblockable as long as defending player controls an artifact land." Whether Tanglewalker is unblockable depends only on whether the player being attacked by it controls an artifact land. Example: Guiltfeeder reads, in part, "Whenever Guiltfeeder attacks and isn't blocked, defending player loses 1 life for each card in his or her graveyard." Only the player being attacked loses life due to Guiltfeeder's ability.	308.1. As the declare attackers step begins, the active player declares attackers (this game action doesn't use the stack). If the game allows the active player to attack multiple other players, he or she declares which player each creature is attacking. Effects from a creature that refer to a defending player refer only to the defending player it is attacking. Then any abilities that triggered on attackers being declared go on the stack. (See rule 410, "Handling Triggered Abilities.") Then the active player gets priority and players may play spells and abilities. Example: Tanglewalker reads, "Creatures you control are unblockable as long as defending player controls an artifact land." Whether a creature you control is unblockable depends only on whether the player being attacked by it controls an artifact land. Example: Guiltfeeder reads, in part, "Whenever Guiltfeeder attacks and isn't blocked, defending player loses 1 life for each card in his or her graveyard." Only the player being attacked loses life due to Guiltfeeder's ability.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

308.1.

As the declare attackers step begins, the active player declares attackers (this game action doesn't use the stack). If the game allows the active player to attack multiple other players, he or she declares which player each creature is attacking. Effects from a creature that refer to a defending player refer only to the defending player it is attacking. Then any abilities that triggered on attackers being declared go on the stack. (See rule 410, "Handling Triggered Abilities.") Then the active player gets priority and players may play spells and abilities.

Example: Tanglewalker reads, "Creatures you control are unblockable as long as defending player controls an artifact land." Whether Tanglewalker is unblockable depends only on whether the player being attacked by it controls an artifact land.

Example: Guiltfeeder reads, in part, "Whenever Guiltfeeder attacks and isn't blocked, defending player loses 1 life for each card in his or her graveyard." Only the player being attacked loses life due to Guiltfeeder's ability.

308.1.

Example: Tanglewalker reads, "Creatures you control are unblockable as long as defending player controls an artifact land." Whether a creature you control is unblockable depends only on whether the player being attacked by it controls an artifact land.