I borrowed this Concept from @xxaby

The idea is to door by recasting Vivien for free nearby the Opponent's Avatar. She will have the printed abilities of: Vile Imp, Keening Banshee, and Fey Changeling ...because all three of them will be on a Standing Stones.

Cast Viv, do 2 damage nearby, bounce Viv... rinse, lather, repeat.

Obviously you have to avoid Feast of Crows and survive long enough to get the pieces in place.

Not my idea, but I'm gonna put it thru the gauntlet.