Who do I choose?

I can't decide on who to take I heard Silk is amazing but I do already have Hulk, Photon, and Nefaria as 7* and my best Skill champ is Shang Chi so idk who benefits me more.

I can't decide on who to take I heard Silk is amazing but I do already have Hulk, Photon, and Nefaria as 7* and my best Skill champ is Shang Chi so idk who benefits me more.