In some TCG challenges, the Pyro Whopperflower has a passive skill called Masterful Mimicry: "At the start of the Round: The opponent must Select 1 of 3 random cards. If they choose the Whopperflower's Disguise, the Whopperflower gains 1 Energy."
Choosing a real card lets you keep it, while choosing a disguise gives you an unusable card. The disguised cards have subtly wrong names or artwork, below is a list of them for reference.
Asmo's Bow
The correct card name is Amos’ Bow.
Controlled Directional Blast
The name is wrong in Chinese but the English translation shows the correct name.
Delicious Macarons
The correct card name is Rainbow Macarons.
Favonius Cathedral
The name is wrong in Chinese but the English translation shows the correct name.
Former Site of the Central Laboratory
The correct card name is Central Laboratory Ruins.
Gilded Dreams
The card depicted is actually Shadow of the Sand King, not Gilded Dreams. The cost is also wrong.
King's Valet
The correct card name is King’s Squire.
Laurel Coronet
Probably a translation error.
Lumenarystone
The correct card name is Lumenstone.
Skyward Sword
The correct card name is Skyward Blade.
Sweet Ma'am
The correct card name is Sweet Madame.
Tandoori Grilled Chicken
The correct card name is Tandoori Roast Chicken.
Tenacity of the Millelith
The card depicted is actually General’s Ancient Helm, not Tenacity of the Millelith.
The Tale of Vennessa
The correct card name is The Legend of Vennessa.
Tomb of the Eternal Flow
The correct card name is Tome of the Eternal Flow.
Underwater Treasure Hunt
The name is wrong in Chinese but the English translation shows the correct name.