Marik Ishtar is a character that's suspected to be coming soon. There are several files found in the game showing a character selection icon, and a player profile icon. Similar to Yugi Muto, he has an alter ego called Yami Marik. His Yami version is more likely to be an unlockable character to avoid having 2 of the same character. Marik Ishtar might make an appearance through a mini event just like the Yugi Muto event.
Based on the anime, Marik Ishtar takes control of other people and use their decks to duel and does not duel himself, unless he is in his Yami Marik form. If he were to appear, he could be bringing other gravekeeper monsters like Gravekeeper's Descendant, similar to Ishizu and Odion's duel rewards.
Why you keep saying this
He had many duels in the anime through his mind slaves like yami Joe
Yami Marik is also born from marik's hatred so his skills are actually marik skills in dueling
If you mean a face to face duel no he never had one but he had many duels using other people and different decks
In this case he's a superb
Thanks for Marik and for you all for being geniuses enough to support Marik :D
We all are friends and we must stay together and support our Marik until the end and no matter how much the haters tried to stop us :)))