Playing the new “Haunted Carousel” brawl, and my opponent played Defile, dealing 1 damage to all minions. All the Dreadsteeds were resummoned, then Defile triggered again.
This continued until my opponent conceded. It might have just gone on forever otherwise.
UPDATE: I’ve been informed that Defile has a limitation to prevent this from happening forever, so I was wrong. Thanks, all!!