It has high health, but very low attack (probably the lowest in the game). Energy gain is fairly quick, and blue skill activation is about as fast as Oasis’. It attacks the closest enemy moderately quickly with its basic flash attack, so I’d imagine it’s decent at racking up poison counters. As with any good white skill, punk is always a good partner (and especially good if the summoned fox, who sits on top of Shining, sticks around). Hermit can boost the summoned fox to make it a bit more bulky or pony could make sure it stays alive. With all those support heroes, you’d want strong attackers in the front (or you could go with a status-inducing strategy with heroes like golem and warden).
It has a niche defensively in that it prevents attacks from dagger and swash, heroes often used to clean. Since it summons fox at 0 energy it’s not as useful as plain fox in terms of normal defense. It can be useful in cleans due to its blue skill, but I don’t think I’d use it in normal offensive war attacks. Dungeon is obviously where it shines (pun intended), but since the other 4 heroes have to carry it around your walking speed is reduced (amount of reduction depends on who’s in your party).