The concept of the "Valkyrie" cards is derived from the valkyries of Norse mythology. Like most of Zigfried's cards, the "Valkyrie" cards are named after characters from the opera Der Ring des Nibelungen.
Despite being based on the same mythology, this archetype has no relation to the "Nordic" archetype.
The names of the "Valkyrie" monsters "Erste", "Zweite", and "Dritte" are the German words for "first", "second" and "third", respectively. However, in the anime dub, the second "Valkyrie" is named "Zwei", which means "two"; "Brunhilde" is named after Brynhild. The Continuous Spell Cards that support them are inspired on the three Norns, female figures from the Norse Mythology that rule the fate of the humans, namely Skuld, Verðandi, and Urðr.
TCG Naming issues
There are some issues regarding the archetype's name in the TCG, mostly because it wasn't released in the OCG first. Thus, despite the fact it was not released in Japan, according to recent errata, “Dark Witch”, “Dunames Dark Witch”, "Element Valkyrie" and "Valkyrie of the Nordic Ascendant" are not considered "Valkyrie" monsters.
Also, in the French, Italian, Portuguese and Spanish versions, the archetype names contain a hyphen (e.g. French "Valkyrie-") to exclude all cards that have "Valkyria" or "Valkyrian" in their English names that have been released prior to the realization of this archetype in the TCG, including "Dark Valkyria", "Power Angel Valkyria", "Magician's Valkyria" and "Valkyrian Knight". This is necessary because the English "Valkyria" and "Valkyrian" have been translated to the only words for "valkyrie" in these languages. The hyphen is only used in the names of "Valkyrie" monsters in whose cases the hyphenated archetype names function as prefixes, therefore an archetype condition is added to the card text of "Ride of the Valkyries" to include it in the archetype in these languages. These aren't issues with the German names, because translations for "Valkyrie" ("Walküre") and "Valkyria" ("Valkyre") / "Valkyrian" ("Valkyrischer") are sufficiently distinct.
The Deck sticks foremost to the all-or-nothing tactic of using "Ride of the Valkyries" from the anime, to perform an OTK as soon as possible. The first three "Valkyrie" monsters work in tandem to clear the field and enable their ATK-raising effects.
"Brunhilde" is the ace of the monster line-up. Its main role is to punish swarming by increasing its ATK to surprisingly heights, depending on Deck match-up, as well as giving the other "Valkyrie" monsters immunity to battle destruction. Its immunity against opposing Spell Effects can come in handy against certain troublesome cards and/or whole decks, for example, "Lair of Darkness", "Lost World" and "Zombie World", as well as generic cards such as "Book of Moon", "Raigeki" and "Sky Striker Maneuver - Afterburners!".
"Mischief of the Time Goddess" is the objectively most dangerous Spell Card their strategy relies on, as it not only gives the player an additional Battle Phase, but it also bypasses the negative effect of "Ride of the Valkyries". Also, it could allow cards like “Where Arf Thou?” and "Into the Void" to be played safely, bypassing the damage or mass-discard effect during the End Phase, and as a side note, if you used “Honest” for an attack boost, your Valkyrie monster gets to keep it because the end phase is skipped so it doesn’t go away. This card not only gives you two battle phases but as it skips a whole turn, you can activate your Trap cards shortly after you’ve set them, you get 1 additional normal summon during Main Phase 2 (assuming you didn’t win with 2 battle phases), and once per turn effects can be activated again. “Foolish Burial Goods” is also a good tech option to send this card to the GY so that you can recover it with “Ride of the Valkyries”.
“Valkyrie Dritte” is the deck’s main searcher as it can add any Valkyrie monster or “Ride of the Valkyries” to your hand, but even if you’re running 3 copies, you might not always draw into it so running a few copies of “Condemned Witch” would be useful as it can special summon her straight from the deck, granting you her search effect, while also being a good search card herself for the “Forbidden” quick-play spells.
As the deck can still be vulnerable to battle traps like the “Mirror Force” card and its counterparts, teching in cards like “Twin Twisters” and “Hey, Trunade!” to get rid of problematic backrow would be a good idea.
This Deck doesn’t rely too much on the extra Deck, as the OTK strategy means you’re trying to finish off the opponent with the “Valkyries” themselves, as a result you can run “Pot of Indulgence” for extra draw power as losing 3-6 extra Deck monsters would not negatively affect your deck.
The three goddesses ("Skuld", "Verdande" and "Urd") can have a supportive role by preemptively banishing dangerous cards the opponent could have drawn, while protecting the "Valkyries" from being targeted and destroyed by opposing effects. This also creates an opportunity for the player to use cards like "Conscription" and "Mind Crush". As a last resort, they can be used to summon "Hamon, Lord of Striking Thunder" or “Dragon Queen of Tragic Endings”.
The deck fails in not having a more intricate gameplay, gambling in an all-out strategy in order to finish the game as soon as possible, in a reminiscence of the feared Zigfried's strategy in the anime. That said, the Deck can be vulnerable to cards that prevent them from conducting the Battle Phase or attacking, such as "Threatening Roar" or "Battle Fader". Despite the protection given by "Goddess Urd's Verdict", they are still vulnerable to cards like "Quaking Mirror Force", "Drowning Mirror Force", "Floodgate Trap Hole", etc. This fast-paced strategy also renders them vulnerable to cards like "Anti-Spell Fragrance" and "Imperial Order" can be fatal to the Deck, postponing the activation of key cards such as "Ride of the Valkyries" and "Mischief of the Time Goddess".