Beta Edition
Circle of Protection: Blue
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Enchantment 
(CMC:2)
: Prevents all damage against you from one blue source. If a source does damage to you more than once in a turn, you must pay 1 mana each time to prevent the damage.
2E • ENDameon Willich
™ & © 1993—1993 Wizards of the Coast
Legal in: Modern,Tempest Block,Ice Age Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander
Oracle Text (click to copy):
View this MTG card on Gatherer
10/4/2004 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. 10/4/2004 Can be used even when there is no damage to prevent. It prevents the next damage (if any) from the source this turn.
Card Circle of Protection: Blue is not on TCGPlayer.