The following are known Action Replay Codes for Marvel Trading Card Game on Nintendo DS (NDS).

Game ID: AMLE-07FAA360

Infinite Points
02182888 05f5e0ff

Press SELECT Unlock All of Story Mode
94000130 fffb0000
12182878 00000306
d2000000 00000000

Press Up+R Button: Card Library 100% Complete
94000130 feef0000
d5000000 00000045
c0000000 00000354
d8000000 0218251e
d2000000 00000000
Holding the DS like a story book, the D-Pad is at the bottom & the R button is at the top behind the left screen.

Press B to for Super Endurance
94000130 fffd0000
62162b64 00000000
b2162b64 00000000
00000038 000003e8
d2000000 00000000

Press A for Enemy -99 HP (EASY K.O.)
94000130 fffe0000
62162b64 00000000
b2162b64 00000000
000000f8 ffffff9d
d2000000 00000000