If your DM will allow it despite the mention of "Arcane Caster level" Life Oracle with Skill Focus: Knowledge (I'd say Planes or Religion, but can be any), Eldritch Heritage Arcane Bloodline for a familiar, Improved Familiar for a Silvanshee Agathion familiar. Nothing will die. Ever.
Did the same to get my oracle an air-elemental familiar. Something really mobile to deliver cure spells is a win.