cr:6.2.5a

If two or more effects would apply to an object at the same time, they are applied in the order determined staging..[6.3.1]

Example: Flourish has the text “The next time an attack would gain {p} this turn, instead it gains that much plus 3.” If there are two static continuous effects that increase {p} and would apply to an object at the same time, the player chooses the order of those effects and thus which one is modified by Flourish’s replacement effect.