Last Updated: 2026-07-16
477.3. 3. Arithmetic
477.3.a. This layer deals with the mathematics of increasing and decreasing the numeric values of the traits of Game Objects. Might Energy Cost Power Cost
477.3.b. When an arithmetic effect from a source that is not a passive ability has a limitation that applies, it is limited at the time of its application, and is "remembered" at that limited level for the duration of its effect. This process is called "snapshotting." Example: If an effect gives a unit "-4 [M] to a min of 1 this turn" choosing a unit with 2 [M], then the effect will generate -1 [M] this turn. Example: A unit reads "Units you control here have their Might increased to 5 [M]." This is a passive ability, so it will not snapshot. Example: A spell reads "Increase a friendly unit's Might to 5 [M]." This effect is applied once, with an unlimited duration. Because it isn't from a passive ability, it will snapshot.
477.3.c. Players cannot increase a numeric attribute by a negative amount. If an effect would instruct a player to do so, they increase it by 0 instead. Example: A player plays Last Stand, which reads "Double a friendly unit's Might this turn. Give it Temporary." The player declares a 2 [M] unit as the target during finalization. In reaction to Last Stand, an opponent plays Eclipse targeting the 2 [M] unit. When Last Stand resolves, the unit is -2 [M]. Last Stand instructs its controller to increase the unit's Might by its current amount, -2, when the double action is performed. This is not possible, so the unit's Might is increased by 0 instead.
477.3.d. Might Bonuses of Attached cards are applied in this layer.
477.3.e. This layer applies arithmetic in the following way.
477.3.e.1. 1. Increases
477.3.e.2. 2. Decreases