Basically, you want to perform this otk with the box that the fox drops.
Tried to rhymed there, anyways, you can activate the otk with the following cards in hand: Marin the Fox, double divine spirit, inner fire and radiant elemental (in this case the divine spirits must be discounted by emperor)
or you can activate it with these cards:
Marin the Fox, double divine spirit, inner fire (without discount), double radiant elemental with discount.
Don't take this deck too competitive, let out that long laugh when you finally do it!
Have a nice one.