As of Core + Dunwich through Undimensioned and Unseen this card simply doesn't seem to have a place. 'Add charges to spells' seems like a solid concept, but this card unlike any other in the game is demanding in money, actions AND slots. Money and hand-slot could perhaps be forgiven, but the sheer number of actions required in order to make this card useful are insane. It's 4r + 2 actions + 1 hand to refresh your Shriveling or RotS once.
The card seemingly is meant to bend towards 'hardcore casters' who want more than two spells and want to cast them all a lot, but by the time you've bought this AND three other spells AND burnt one of those spells of it's charges the game had better well be over or you're probably not going to win. You're better off just overwriting one of your original two spells with the third that you need right now. Now, of course, we do have a character who can use Tome actions for free and uses spells! Ah but wait Daisy Walker is a Seeker, and as such doesn't have access to this card outside of Jim teamwork shenanigans...
It's just a huge miss. Maybe one day we'll have someone who can use certain charged spells without using actions, and when that happens this card will probably still be trash tier. It simply is too far removed from viable play in resource cost, action efficiency, and intended function for it to be worth even the deck slot, let alone 3 exp.
The one thing that might change my mind is if in the future we see a big expensive spell with a single, or limited, charges much the way that Shotgun is mad expensive but also dependent on Extra Ammunition