735.1. Deflect is a Passive Ability keyword.
735.1.a. It is present on Permanents.
735.1.b. It is formatted as "Deflect [X]".
735.1.b.1. The X is referenced in the functional text of the ability.
735.1.b.2. The X is referred to as the Deflect Value.
735.1.b.3. If X is omitted, it is presumed to be 1.
735.1.c. It is functionally short for "Spells and abilities an opponent controls that choose me cost an amount of Power equal to [Deflect Value] more to play as an additional cost."
735.1.c.1. The Power used to pay this cost may always be of any Domain. Example: A Fury spell targets an Order unit with Deflect. The Power used to pay the Deflect cost can be any Domain; it does not need to match the Domain of the spell or the target.
735.1.d. It is an effect that imposes a Mandatory Additional Cost on Spells and Abilities that choose the permanent that has this ability. See rule 346. Playing Cards for more information.