I mean, that is an insane amount of SP you'd have to farm on a dancer. Life and Death 3 is a very odd and expensive choice, unless for some reason you have an excess of 5* units you can freely throw away. It'd be easier to keep Azura's default fortify buff on and give hone attack to someone else.
I like the idea of Fury on a dancer as it's rare that they have to fight, and it helps their frail defenses. Obviously I haven't used Azura who can go toe to toe with red swords but it's not like she's sweeping their team herself. Her normal speed+3 A slot is fine if you don't have a Fury to give out.
If I go ahead and make the Olivia I'm talking about, I'd probably give her a short charge special. Maybe Escutcheon. But yeah, tanking a couple of green mage hits would charge that up and maybe keep her alive against a melee unit that got too close, but in all my time using Olivia in arena I can't think of one time where she would have even gotten a special up. If she's fighting that much, I fucked up and probably lost a unit or two, which is probably a ruined run right there.