Okay, minor edit.
Because I am really hoping someone will try, I can't, since I'm concentrating on Robin Hood now.
I will allow the Diviner to use spells from magical items, because I suppose the magic is deemed to have come from the item, not the caster; so Rings of Invisiblity and Staff of Fire, for example, can be used to cast invisiblity and summon Fire Elemental respectively.
Anybody willing to try?
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If not a Sorcerer, then a Paladin.