Major challenge: The cards' values fluctuate drastically, making it difficult to determine the optimal time to buy or sell. Solution: Utilize reputable websites and community forums that track card prices and market trends.

To capitalize on card value fluctuations, implement a strategy that involves patience and adaptability. Monitor the market closely, identify buying opportunities when prices dip after major events or upgrades, and sell when hype builds or when the players receive boosts or upgrades.