cr:6.3.1

Continuous effects that modify the rules of the game are applied simultaneously before continuous effects that modify objects. If there are two or more continuous effects that modify the state and/or properties of objects in the game, the effects are applied using the staging system. These effects are grouped into stages and are applied in ascending stage order, then if there are two or more effects in the same stage, the effects are applied using substage order, then timestamp order.

Example: Hypothermia has the text “Attacks you control can’t gain go again,” which is a continuous effect that modifies the rules of the game and is applied before any effects would add the go again ability to an attack you control.