For example: if you were to use 5 at the same time, would you get 25CSC per quest, or lose the extra 4 that were used?

If I remember right, they don't stack, but I don't know what happens if you try.

🤔 seems like something i'm going to check...... eventually. i'm worried i'll lose them if i try to use multiples and don't much feel like replacing them lol

You'll get an error if you already have an active Morty Card and try to use a second. It won't eat the card or anything, but you're not able to activate multiple cards at once [edit] You can also link to an item with this sCode instead of linking the image URL itself c:

WAAAT~ tytyty ♪