Diluted Reality

Instant
All combat damage dealt by creatures this turn is reduced by half, rounded down.
This is definatly an on color combat trick that I think blue can handle. Although this ability has drifted more toward white, it is definalty flavorful in blue.
CURRENT WORDING:Diluted Reality

Instant
All creatures get -X/+X until end of turn, where X is equal to the number of cards in your hand.