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Mysterious Grimoire: Ancient Guardian's Book (4) 3.3

Not only is it a useful card for stopping plays, but being able to use it during your opponents turn, could do more than protect your monsters

Notably, 42 finalists received these cards, and each was personalized with the trainers name and a custom design

This same logic applies to cards that counter spells, like Nether Void or Planar Chaos

As you might expect, these aren't going to turn up just anywhere

Numerical Theme Naming: With the exception of Brunhilde, Erda and Sigrun, as well as their two Chariot Union monsters, all of the Valkyrie's names are derived from the names of numbers in German