History of CR 615.7

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage—for example, “Prevent the next 3 damage that would be dealt to any target this turn.” These work like shields. Each 1 damage that would be dealt to the “shielded” permanent or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded permanent or player by two or more applicable sources at the same time, the player or the controller of the permanent chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn’t matter.
January 25, 2019 · Ravnica Allegiance
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage-for example, "Prevent the next 3 damage that would be dealt to any target this turn." These work like shields. Each 1 damage that would be dealt to the "shielded" permanent or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded permanent or player by two or more applicable sources at the same time, the player or the controller of the permanent chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn't matter.
April 27, 2018 · Dominaria
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage—for example, “Prevent the next 3 damage that would be dealt to any target this turn.” These work like shields. Each 1 damage that would be dealt to the “shielded” permanent or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded permanent or player by two or more applicable sources at the same time, the player or the controller of the permanent chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn’t matter.
May 1, 2014 · Journey into Nyx
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage—for example, “Prevent the next 3 damage that would be dealt to target creature or player this turn.” These work like shields. Each 1 damage that would be dealt to the “shielded” creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn’t matter.
February 1, 2014 · Born of the Gods
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage -- for example, "Prevent the next 3 damage that would be dealt to target creature or player this turn." These work like shields. Each 1 damage that would be dealt to the "shielded" creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn’t matter.
September 30, 2011 · Innistrad
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage -- for example, "Prevent the next 3 damage that would be dealt to target creature or player this turn." These work like shields. Each 1 damage that would be dealt to the "shielded" creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn't matter.
June 17, 2011 · Commander 2011
Some prevention effects generated by the resolution of a spell or ability refer to a specific
April 1, 2011 · Duel Decks: Knights vs. Dragons
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage -- for example, "Prevent the next 3 damage that would be dealt to target creature or player this turn." These work like shields. Each 1 damage that would be dealt to the "shielded" creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn't matter.
February 4, 2011 · Mirrodin Besieged
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage—for example, “Prevent the next 3 damage that would be dealt to target creature or player this turn.” These work like shields. Each 1 damage that would be dealt to the “shielded” creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn’t matter.
October 1, 2010 · Scars of Mirrodin
Some prevention effects generated by the resolution of a spell or ability refer to a specific
February 1, 2010 · Worldwake
Some prevention effects generated by the resolution of a spell or ability refer to a specific amount of damage -- for example, "Prevent the next 3 damage that would be dealt to target creature or player this turn." These work like shields. Each 1 damage that would be dealt to the "shielded" creature or player is prevented. Preventing 1 damage reduces the remaining shield by 1. If damage would be dealt to the shielded creature or player by two or more applicable sources at the same time, the player or the controller of the creature chooses which damage the shield prevents. Once the shield has been reduced to 0, any remaining damage is dealt normally. Such effects count only the amount of damage; the number of events or sources dealing it doesn't matter.