In 2015, packs of Marvel 3D trading cards contained playable cards for Legendary. All but one card, a Stan Lee Bystander, were reprinted in the 2019 expansion Dimensions. This makes Stan Lee the only gameplay unique card from Marvel 3D that cannot be obtained in another printing of the game.

A Bystander promo card featuring Stan Lee and the rules text:

"When you rescue this Bystander, say a hero name. Then reveal the top three cards of your deck. Put one of those cards with that exact Hero name into your hand. Put the rest back in any order."

The full list of Marvel 3D Legendary Cards is this:

Complete list of Legendary playable cards in the Marvel 3D trading cards:

Bulldozer Driver (special bystander, 1 card)

Double Agent of S.H.I.E.L.D. (special bystander, 1 card)

Fortune Teller (special bystander, 1 card)

Photographer (special bystander, 1 card)

Stan Lee (special bystander, 1 card)

Black Widow (same 14 cards as the base set, but with alternative artwork)

Deadpool (same 14 cards as the base set, but with alternative artwork)

Hulk (same 14 cards as the base set, but with alternative artwork)

Circus of Crime (new henchmen group, need 10 copies but all are identical)

Spider-Slayers (new henchmen group, need 10 copies but all are identical)

Howard The Duck (new hero, 14 cards total: 5 commons "Traveling Companion"; 5 commons "Rebel Without a Cause"; 3 uncommons "Right Place, Wrong Time"; 1 rare "Interplanetary Visitor"

Man-Thing (new hero, 14 cards total: 5 commons "Form from Ooze", 5 commons "Burn the Fearful", 3 uncommons "Travel the Nexus of Realities", 1 rare "Eternity of Solitude"

The Artwork for Stan Lee is by community member: Jalt