No set is complete without a Prerelease pack! Core Set 2021's pack is pretty much what you're used to—6 boosters; 1 foil date-stamped card; and an insert. This insert has a timeline of Teferi's life, from his childhood at the Academy to the War of the Spark.
How do you get a Prerelease pack? Sign up for a prerelease at your local game store! It's a great way to get hyped for a new set and test out the physical cards as soon as possible.
TOP-SECRET TEFERI FACT #7:
Teferi is a tenor with the voice of an angel. The angel desperately wants it back.