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The Grixis color combination isn't great at ramping mana, but vampires tend to be very efficient in their cost and rely on each other for benefit, besides, you are limited to casting one collected card on each player's turn, so it's not broken right

Make sure your deck has an answer to Control or you play Control yourself

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Choose the Right Platform: Decide whether to sell through online marketplaces, auction sites, or local events

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Knowing what cards to swap out Testing a deck and playing several games with it are definitely good ways to figure out the decks strength's and weaknesses