What's that boss monsters that turned out to be a massive letdown? | tcgmode

As you can see, it's Nerva for me, I was so thrilled when I built Artmage on Master Duel because I loved Nerva's design but, when I used it in a match I said "Really?". How many activated effects? - One... Ok... What is it? Turns any Artmage monster effect into a nuclear bomb - Oh, cool! The...