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)
418.5i. [Click to view all changes.]
418.5i. Some effects can switch a creature's power and toughness. When they're applied, they take the value of power and apply it to the object's toughness, and take the object's toughness and apply it to the object's power. Any effects that are applied after the switching effect apply normally. Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. After the "switch" effect resolves, another effect gives the creature +5/+0. Its power and toughness is 9/1. Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. If the +0/+1 effect ends before the switch effect ends, the creature becomes a 3/1.	418.5i. Some effects switch a creature's power and toughness. When they're applied, they take the value of power and apply it to the object's toughness, and take the object's toughness and apply it to the object's power. These effects are applied after all other effects that affect power and toughness. (See rule 418.5a.) Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. A new effect gives the creature +5/+0. Its "unswitched" power and toughness would be 6/4, so its actual power and toughness is 4/6. Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. If the +0/+1 effect ends before the switch effect ends, the creature becomes a 3/1.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

418.5i.

Some effects can switch a creature's power and toughness. When they're applied, they take the value of power and apply it to the object's toughness, and take the object's toughness and apply it to the object's power. Any effects that are applied after the switching effect apply normally.

Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. After the "switch" effect resolves, another effect gives the creature +5/+0. Its power and toughness is 9/1.

Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. If the +0/+1 effect ends before the switch effect ends, the creature becomes a 3/1.

418.5i.

Some effects switch a creature's power and toughness. When they're applied, they take the value of power and apply it to the object's toughness, and take the object's toughness and apply it to the object's power. These effects are applied after all other effects that affect power and toughness. (See rule 418.5a.)

Example: A 1/3 creature is given +0/+1 by an effect. Then another effect switches the creature's power and toughness. Its new power and toughness is 4/1. A new effect gives the creature +5/+0. Its "unswitched" power and toughness would be 6/4, so its actual power and toughness is 4/6.