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Use a reference: Compare against a known authentic card of the same set

The holofoil D23 Promo Card of this Disney Lorcana alien is currently valued on TCGPlayer at $2,500 USD

For example, a card with a Cumulative Upkeep of 1 requires you to spend 1 mana on your first upkeep, then 2 on your second upkeep, then 3 on your third upkeep and so on

The other two effects are also strong

There are numerous professional grading companies, but cards graded by Professional Sports Authenticator (PSA) generally fetch the highest prices on the market thanks to its popularity with collectors

You can obtain the Mega Mawile ex (2-Stars rarity) card by opening Fantastical Parade from Fantastical Parade set