Water quest and silvershield assassin

Today I had the water splinter for my daily quest. I did pretty well against the other players who also seemed to have the water splinter today. I wish I had a lord A or 3 that would make my deck better against the water teams. I did get these reward cards including a silvershield assassin. I really like the assassin.
I am going to sell it though because mine is already level 3.