Rule 613.7a

A continuous effect generated by a static ability has the same timestamp as the object the static ability is on, or the timestamp of the effect that created the ability, whichever is later. If the effect that created the ability has the later timestamp and the object the ability is on receives a new timestamp, each continuous effect generated by static abilities of that object receives a new timestamp as well, but the relative order of those timestamps remains the same. Example: Rune of Flight is an Aura that grants enchanted Equipment “Equipped creature has flying.” A player attaches Rune of Flight to Colossus Hammer, an Equipment with “Equipped creature gets +10/+10 and loses flying.” The ability granted by Rune of Flight shares Rune of Flight’s timestamp because it is later than Colossus Hammer’s timestamp. If Colossus Hammer becomes attached to a creature, both of its abilities receive new timestamps (see rule 613.7e), but the relative order of those timestamps remains the same.