If I Frigid Touch repeated on mutated Mouser, then they pump it with Discipline after the action of Frigid Touch resolves, what power is mutated Mouser?

To determine the final Might of Mutated Mouser, we must follow the rules for calculating Might modifications, specifically the order in which these effects are applied according to the layers system.

The Calculation

According to Rule 472.3.d, Might modifications are applied in a specific order:

1. Increases (e.g., Discipline) are applied first.
2. Decreases (e.g., Frigid Touch) are applied last.

Regardless of when you play the spells during the turn, the game engine re-evaluates the Might of the unit by applying all bonuses first, then all penalties.

Scenario Breakdown:

• Base Might of Mutated Mouser: 1
• Effect of Discipline: +2 Might
• Effect of Frigid Touch (Repeated): -4 Might (-2 for the initial effect, -2 for the repeat)

Step-by-Step Math:

1. Start with base: 1 Might.
2. Apply Increases: 1 + 2 (from Discipline) = 3 Might.
3. Apply Decreases: 3 - 4 (from Frigid Touch repeated) = -1 Might.

Result

Your Mutated Mouser will have -1 Might.

Per RiftJudge FAQ #9688 and FAQ #421, units can have negative Might values. While the game treats this as 0 Might for all practical purposes (like combat or determining if the unit dies), the -1 value is still tracked internally. If you were to apply another buff later this turn, it would be added to that -1 value.