Farewell not exiling
Opponent played Farewell, choosing to exile all graveyards as one of the options. Farewell remained in his graveyard after resolution! This was in a Maestros Tournament special event, and he cast it again, choosing just "destroy all creatures" using the Maestros event ability, AND IT REMAINED IN HIS GRAVEYARD AGAIN instead of exiling a 2nd time! Thie card is borked anyway [how about "Choose two" instead of "choose any/all" or the exiling function only being available as a kicker? Anyway, WotC really needs to start play-testing the new cards before issue, there are too many cards that are automatic "I wins" in the game.
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[Deleted User] commented
Farewell is on the stack resolving when graveyards are exiled. It will be the only card in the graveyard afterwards