While it may not explode onto the battlefield as fast as some other payoffs, it gives you inevitability, which forces opponents to answer your massive threats or drown under the weight of your cycling engine
Once per each turn when you activate ninjutsu, you can look at the top three cards of your deck, take one, and put the other two at the bottom
Duress can also remove opposing Lightning Bolts and removal, and that comes in very handy against pretty much every matchup, except maybe hatebears
I didn't feel the need to spend extra money on the deck as I had a feeling she'd be plenty powerful with what I had
Playing against discard strategies and watching your hand of cool cards slowly bleed away is frustrating enough, but watching those cards go to your opponents boards, for free
Given how its limited to Arena, I have a hard time quantifying it against paper cards