I’ll be answering is Marshmallon in Duel Links.
Is Marshmallon in Duel Links
No. That card and quite a few others are actually banned from the game.
Duel Links Explained
Duel Links has been known to have a few cards banned in an attempt to keep their game as fair as possible.
If you were trying to find a way to check the game and see what cards are available for use, there’s a simple procedure you can use.
All you have to do is go to Duel Studio, Card Catalog, and then perform a search.
Duel Masters
Although that card is banned from Duel Links, Duel Masters has been known to have cards most duelists look for (including this).
RealTalkAJ 
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