cr:6.2.5

The first time a continuous effect applies to an object, or when a continuous effect changes how it modifies an object, it applies as an event which can be modified by replacement effects and trigger triggered effects. Each application of a continuous effect is considered a separate event.

Example: Talisman of Featherfoot has the text “When an attack you control gains exactly +1{p} from an effect during the reaction step.” If an attack has 0 base power and is affected by a -1{p} continuous effect, then it is affected by a new +2{p} effect during the reaction step, Talisman of Featherfoot would not trigger because an effect of exactly +1{p} has not been applied during the reaction step.