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.
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.
The Deck sticks foremost to the all-or-nothing tactic of using "Ride of the Valkyries" from the anime. 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".
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".
The deck fails in not having a more intrincate gameplay, gambling in an all-out strategy in order to finish the game as soon as possible, in a reminiscence of the feared Zigfried 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".