Ok, from what I remember Atticus O'Sullivan can increase his strength, speed, toughness and healing by drawing on Earth magic. Basically he has to be in contact with natural earth in order to use these abilities (including not having shoes on for a lot of it) and in order to properly heal has to be laying down on his right side so that his tattoos are in contact with the earth (meaning he's probably also mostly naked). He can store up some energy to do this when not in contact with the Earth, but right now you don't have enough refresh to get his amulet, so no dice.
I would give him Modular Abilities for most of his Earth Magic, although I wouldn't do it at Supernatural levels (yet).
Modular Abilities (-5)
Limited to Inhuman Strength, Inhuman Speed, Inhuman Recovery, Inhuman Toughness (the catch +1 must be in contact with natural earth). Basically at this point he can swap out 3 points of powers. So either Inhuman Strength or Inhuman Speed and a Recovery or Toughness Power. He can switch out which abilities as an action.
I would also give him Beast Change -1 since he can shape shift into certain pre-chosen forms. Although Beast Change only lets you transform into one form. As a house rule, you might find out if you can use modular abilities to take certain abilities under "Creature Features" in the book (YS 162) only when shapeshifted. There is a custom power called
Family Shifter that your GM might allow to cover only your pre-chosen forms, but that will be up to them. The cost differences are pretty severe though (-1 for Beast Change, -4 for Family Shifter).
As for his Magical abilities, I would almost say that is Sponsored Magic tied to Binding and Unbinding of natural fibers. As Sponsored Magic with no other Magic abilities, that would cost him -4, although I would put a limitation on this of +1. If this magic is used to kill anybody, he dies (which is stated in the book). He doesn't take lawbreaker, he doesn't change an aspect. Character dead. Finite, caput.