Yuna has two abilities, both related to her summoning ability
This is a more fringe one as far as gameplay goes, but hey, as I said, the reserved list has plenty of "bad" cards
A thread where you describe your design strategy and goals, providing useful information and a guide on how to view the set, along with a link to an external card database, would be much easier on your users and far and away more helpful in soliciting worthwhile feedback
The Pokemon Company still does print some awfully powerful Supporters from time to time, with one being a card you can't play without
Four of Magics five colors get a dedicated form of elemental bending from the Avatar universe with different unique effects: white (airbending), blue (waterbending), red (firebending), and green (earthbending)