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Chart shows the price of Gyarados [Reverse Holo] #20 at the end of each month going back as long as we have tracked the item.

After browsing through all the sold listings, there are none listed for my particular card but it is always worth taking a look here anyway

To allow us to maximize the power/toughness-to-cost ratio, we put double mana of both white and black in the mana cost

Card Name Mana Cost Type Legendary Creature Avatar Rarity Uncommon rules Text Flying Particle Beam - When Cloud of Darkness enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard