1. Numbers can never go below 0. If a number would go below 0, instead it’s set to 0.
2. All numbers must be whole numbers. For example, if a card says “pick a number for X” you cannot pick 2˝.
3. Any variable number on a card (written as X, Y, Z, etc.) that is not currently being played is considered to be a 0.
4. If a number is increased and/or reduced by more than one thing at the same time, apply all increases first followed by all reductions. (Note: this does not apply to numeric cost because it has its own set of rules to handle cost increases and reductions. See “Numeric Cost” in the “Common Terms” section.)