Mermaid shark is a really good search card and fits really well in a water xyz deck. If it wasn't level 1 when it was released irl or in duel links, it would see way too much usage. Luckily, Shark has a skill called "Territory of the Sharks." It makes all monster on the field level 4.
Thank you for visiting Duel Links wiki by GameA! We update this Yu-Gi-Oh! Duel Links community day by day to provide quality guides and the latest news.