Even though the condition is quite specific, the number of DARK 0 defense monsters are quite wide. Although most of them do not synergize with each other.
Steelswarm
Most Steelswarm monsters have 0 defense and serve no purpose in the graveyard, therefore Recurring Nightmare would be an excellent card for this deck to gain advantage.
Not sure why you'd immediately single out World Carrotweight Champion as a card to think about here. It's a card that doesn't benefit from being in the hand in decks that don't have any other targets.
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