best valkyrie deck yugioh Amazon.com: Complete Custom for Yu-Gi-Oh! VALKYRIE DECK TO MASTER??? YUGIOH

Energy Cards: Power up attacks

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Proliferate cards, like Cankerbloom and Yawgmoth, Thran Physician, help a ton here too, giving you even more experience to work with

Artifact Ward Ah, Antiquities

So not only does this card prevent your opponent from summoning more monsters of different attributes as the game progresses, but you can actually use this card to board-wipe your opponent