457.1. When an effect begins applying, it establishes a time for which it is compared against other Game Effects for purposes of resolving Layered effects as its Timestamp.
457.1.a. Timestamps are not rote values.
457.1.b. Timestamps are relative comparisons between effects and when they began applying to the game.
457.1.c. Timestamps are not referenced by Game Effects in any way. They are only used to finalize layered effects.