Rule 809.1.c
It is functionally short for "Spells and abilities an opponent controls that target [me/this] cost an amount of Power equal to [Deflect Value] more to play as an additional cost for each time they choose [me/this]."
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It is functionally short for "Spells and abilities an opponent controls that target [me/this] cost an amount of Power equal to [Deflect Value] more to play as an additional cost for each time they choose [me/this]."