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)
418.5b. [Click to view all changes.]
418.5b. If an effect other than a type-, subtype-, and supertype-changing effect should be applied in different layers, the parts of the effect each apply in their appropriate layers. If a type-, subtype-, and supertype-changing effect should be applied in different layers, all are applied only in layer four (type-, subtype- and supertype changing effects). Example: A player plays an ability that reads "{2}: Until end of turn, Chimeric Sphere becomes a 3/2 artifact creature," which is a both a type-changing effect and a power- and toughness-changing effect. Since it's a type-changing effect, the entire effect is applied when type-changing effects are applied, in layer four, even though power- and toughness-changing effects are normally applied in layer six. Later in the turn, Chimeric Sphere is affected by an ability that reads "Target creature becomes 0/2 until end of turn," which is applied only in layer six since it's solely a power- and toughness-changing effect. At this point, playing Chimeric Sphere's (layer 4) ability again won't do anything, as the layer-six effect will always be applied after it. The artifact creature remains 0/2. Example: An effect that reads "Wild Mongrel gets +1/+1 and becomes the color of your choice until end of turn" is both a power- and toughness changing effect and an "other" kind of effect. The "becomes the color of your choice" part is applied in layer five, and then the "gets +1/+1" part is applied in layer six. Example: Grab the Reins has an effect that reads "Until end of turn, you gain control of target creature and it gains haste." This is both a control-changing effect and an "other" effect. The "you gain control" part is applied in layer two, and then the "it gains haste" part is applied in layer five.	418.5b. If an effect should be applied in different layers, the parts of the effect each apply in their appropriate layers. If an effect starts to apply in one layer, it will continue to be applied to the same set of objects in each other applicable layer, even if the ability generating the effect is removed during this process. Example: An effect that reads "Wild Mongrel gets +1/+1 and becomes the color of your choice until end of turn" is both a power- and toughness-changing effect and an "other" kind of effect. The "becomes the color of your choice" part is applied in layer 5, and then the "gets +1/+1" part is applied in layer 6. Example: Grab the Reins has an effect that reads "Until end of turn, you gain control of target creature and it gains haste." This is both a control-changing effect and an "other" effect. The "you gain control" part is applied in layer 2, and then the "it gains haste" part is applied in layer 5. Example: An effect that reads "All noncreature artifacts become 2/2 artifact creatures until end of turn" is both a type-changing effect and a power- and toughness-setting effect. The type-changing effect is applied to all noncreature artifacts in layer 4 and the power- and toughness-setting effect is applied to those same permanents in layer 6, even though those permanents aren't noncreature artifacts by then.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

418.5b.

If an effect other than a type-, subtype-, and supertype-changing effect should be applied in different layers, the parts of the effect each apply in their appropriate layers. If a type-, subtype-, and supertype-changing effect should be applied in different layers, all are applied only in layer four (type-, subtype- and supertype changing effects).

Example: A player plays an ability that reads "{2}: Until end of turn, Chimeric Sphere becomes a 3/2 artifact creature," which is a both a type-changing effect and a power- and toughness-changing effect. Since it's a type-changing effect, the entire effect is applied when type-changing effects are applied, in layer four, even though power- and toughness-changing effects are normally applied in layer six. Later in the turn, Chimeric Sphere is affected by an ability that reads "Target creature becomes 0/2 until end of turn," which is applied only in layer six since it's solely a power- and toughness-changing effect. At this point, playing Chimeric Sphere's (layer 4) ability again won't do anything, as the layer-six effect will always be applied after it. The artifact creature remains 0/2.

Example: An effect that reads "Wild Mongrel gets +1/+1 and becomes the color of your choice until end of turn" is both a power- and toughness changing effect and an "other" kind of effect. The "becomes the color of your choice" part is applied in layer five, and then the "gets +1/+1" part is applied in layer six.

Example: Grab the Reins has an effect that reads "Until end of turn, you gain control of target creature and it gains haste." This is both a control-changing effect and an "other" effect. The "you gain control" part is applied in layer two, and then the "it gains haste" part is applied in layer five.

418.5b.

If an effect should be applied in different layers, the parts of the effect each apply in their appropriate layers. If an effect starts to apply in one layer, it will continue to be applied to the same set of objects in each other applicable layer, even if the ability generating the effect is removed during this process.

Example: An effect that reads "Wild Mongrel gets +1/+1 and becomes the color of your choice until end of turn" is both a power- and toughness-changing effect and an "other" kind of effect. The "becomes the color of your choice" part is applied in layer 5, and then the "gets +1/+1" part is applied in layer 6.

Example: Grab the Reins has an effect that reads "Until end of turn, you gain control of target creature and it gains haste." This is both a control-changing effect and an "other" effect. The "you gain control" part is applied in layer 2, and then the "it gains haste" part is applied in layer 5.

Example: An effect that reads "All noncreature artifacts become 2/2 artifact creatures until end of turn" is both a type-changing effect and a power- and toughness-setting effect. The type-changing effect is applied to all noncreature artifacts in layer 4 and the power- and toughness-setting effect is applied to those same permanents in layer 6, even though those permanents aren't noncreature artifacts by then.