Mysterious Limousine + Farewell resolution bug
My opponent plays Mysterious Limousine, targeting my Sheoldred. I cast Farewell, choosing all modes (which includes exiling creatures and artifacts). By the way the stack resolves in paper Magic, Farewell only sees the board state at the time of resolution, and all modes resolve simultaneously. No matter when Sheoldred would return to the board, Limousine must not be on the board for her to return. As Arena resolved it, Sheoldred returned to the board before Farewell fully resolved, and was consequently exiled.
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[Deleted User] commented
Farewell will exile the chosen permanents in the order printed on the card, not simultaneously. The Limousine gets exiled first, Sheoldred comes back, and then is exiled with the creatures.
From Gatherer
If you choose more than one mode for Farewell, you perform the actions in the order written.