Quote from FumarIts a nice design.
However, I seriously doubt she will be UG. I am sure she will favour creature-based strategies, being a Merfolk and thus the iconic blue beater, but I doubt that just because she is in a UGdeck she will be UG.
Kiora Atua is a merfolk planeswalker who commands the powers of the depths. Kiora venerates the huge creatures of the sea—krakens, leviathans, and other denizens of the inky depths—because for her they are evidence that even the most persistent forces can be endured: time, water, predation, and darkness. Kiora is a blue- and green-aligned Planeswalker. She seems calm and wise, but her dreams are bizarre beyond imagining.
Quote from RuggleyShe is confirmed to be UG but everything is always subject to change I suppose. Nissa was GB and then was printed only G