The front of the card is identical to an official Wizards-printed card both in content and coloration (within variance.) Most notably, these cards do not pass counterfeit checks performed by vendors buying or selling MTG cards
First, check the card numbering, alternate art promos often include a lowercase a after the set number, like 77a/108 or XY67a. That a signals an alternate art version distinct from the standard release
These masks are created by layout artists and are greyscale representations of which parts of the card should show how much foil
Under the section on Lighting Rift I explain how we came up with the idea to have things trigger off of things being cycled
Careful there are a lot of fakes out there that are a lot larger than the real ones
SM - Burning Shadows Charizard GX Secret $274.99 Market Price: $482.72 Fairy Energy Secret $57.00 Market Price: $76.13 Darkness Energy Secret $39.58 Market Price: $46.89 Wicke Full Art $31.00 Market Price: $51.52 Gardevoir GX Secret $29.99 Market Price: $45.12 Acerola Full Art $27.99 Market Price: $43.67 Darkrai GX Secret $20.00 Market Price: $36.31 Machamp GX Secret $18.50 Market Price: $25.89 Fire Energy Secret $18.00 Market Price: $27.85 Guzma Full Art $14.96 Market Price: $21.89 Marshadow GX Secret $11.53 Market Price: $23.82 Noivern GX Secret $11.21 Market Price: $15.07