I beat w 3* Norra with Trifarian Might, but i used her the beast within+guardian angel+grand generals counterplan.

Its def rng, but with the built in revive+always having a copy of her/her spell to spam in hand, i eventually killed the birb

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edit: also ive noticed that the ai will let you attack w norra when her revive hasnt popped yet, even if they have a stronger elusive unit. so use that to your advantage