As soon as the Supreme King is defeated, one of his previous minions seeks out Jaden to build his reputation by defeating him
[P][D] Seventh Echo: 70 damage
However, if the emblem from Tamiyo, Seasoned Scholar's last ability was created before you put Necrodominance onto the battlefield, your maximum hand size would be five
I think having a limited number of cards that can be face down creatures is a better experience overall, as you can make more informed decisions
Then, try to lure her into investing all of her the rest of her mana in Circles or in some other defensive measure, and, when she is out of mana to spend on them, slip in a spell you really want to cast
For example, a green fight ability can target a creature with protection from black