dark structure deck yugioh Yu-Gi-Oh! TCG: World : Toys & Games shaking Structure Deck The Dark Emperor Structure Deck

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Not only does Grief get to come into play for free itself, but the additional resource spent is a card from hand, which also doesnt require mana

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So with the right cards in hand, you can send a creature card to the graveyard and play a spell to call that creature to the battlefield, which is a key strategy in many decks that have black mana cards