Who knows, maybe da Vincis packing a Sword of Feast and Famine in that bonus card slot
When dealing with a card type that can be commonly faked, its important to double check your source and make sure all the information lines up
Other tough inserts include Millionaire Black and Millionaire White cards

TRR 86 1 Boss's Orders RCL 154 1 Pokmon Fan Club UPR 133 2 Pok Ball SUM 125 2 Switch SVI 194 2 Ultra Ball BRS 150 1 Rare Candy SUM 129 1 Super Rod BKT 149 1 Super Scoop Up BUS 124 1 VS Seeker PHF 109 1 Scorching Charcoal CLC 26 2 Computer Search BS 71 Energy - 16 7 Basic Fire Energy CLL FIR 7 Basic Lightning Energy CLL LIG 2 Double Colorless Energy BS 96 Visual Card Breakdown Charizard Deck Set List Charmander (Base Set) Charmeleon (Base Set) Charizard (Base Set) Ponyta (Astral Radiance) Rapidash (Astral Radiance) Magmar (Fossil) Ho-Oh ex (Pokmon TCG Classic) Pikachu (Base Set) Raichu (Sword & Shield) Voltorb (Base Set) Electrode (Base Set) Zapdos (Sun & Moon Promos) Clefairy (Base Set) Clefable (Jungle) Stantler (Secret Wonders) Miltank (Secret Wonders) Dunsparce (EX Sandstorm) Bill (HeartGold & SoulSilver) Boss's Orders (Rebel Clash) Computer Search (Base Set) Pok Ball (Sun & Moon) Pokmon Fan Club (Ultra Prism) Professor Oak (Base Set) Rare Candy (Sun & Moon) Rocket's Admin

Approximate values for reference: A single-layered card sleeve has an approximate thickness of 0.52 mm (0.02 inches)
Vermillion Dragon Mech X FIRE Level 9 [ Machine / SynchroEffect ] ATK 2700 DEF 1800 1 Tuner + 1+ non-Tuner monsters Once per turn: You can banish 1 Tuner from your hand, GY, or face-up field, then target 1 card on the field