Gold Foil Cards
Both Summoners and Monsters can exist in Gold Foil Variations, which occur in packs in approximately 1/50 cards when opening Booster Packs or Loot Chests.
Gold Foil cards are more rare than regular foil, but they require fewer BCX to level up, as pictured below. Gold cards also earn a 10% bonus per Gold card played when battles are won.
Learn more at GOLD FOIL CARDS.
The Gold Foil Rare Serpent of Eld pictured above requires only 22 BCX to be combined for the max level of that card, as opposed to the 115 BCX required to max a regular foil version.

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