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Magician Navigation X TRAP Special Summon 1 "Dark Magician" from your hand, then Special Summon 1 Level 7 or lower DARK Spellcaster monster from your Deck

The first is from Digital TQ, who posted their breakdown here

Maybe your opponent has a seriously strong extra deck monster, and youd like to send it back from whence it came

Offering card draw, removal, and a somewhat expensive, win condition, Vraska, Betrayals Sting does it all

Whereas other prize cards like Chaos Emperor, The Dragon Of Armageddon have been reprinted barely a year after their initial release, it's been nearly nine years since we've heard anything about Blood Mefist