Circle of Protection: Blue : The next time a blue source of your choice would deal damage to you this turn, prevent that damage.
Reglamento oficial (Oracle)
[2004-10-04]A source of damage is a permanent, a spell on the stack (including one that creates a permanent), or any object referred to by an object on the stack. A source doesn’t need to be capable of dealing damage to be a legal choice.
[2004-10-04]Can be used even when there is no damage to prevent. It prevents the next damage (if any) from the source this turn.
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: The next time a blue source of your choice would deal damage to you this turn, prevent that damage.
