Mifare Classic - SAK Swapping Explained

Term	Meaning
WUP-SAK	SAK Value found during the Wake up & Anti-collision process, what you would see reported from a basic search.
Vanity SAK	SAK Value represented in Block 0 of a Mifare Classic, on legitimate cards this does not inform the value of the WUP-SAK.
Magic Card	An illegitimate card capable of changing it's UID; some magic cards are also able to change other values such as ATQA/SAK.