Cards exiled by Robber of the Rich should stay visible
Generally, cards that a player can play from a zone other than their hand are shown next to their hand to both players. They remain visible even if it isn't currently possible to play them, for example because of timing restrictions or not having enough cards in the graveyard to escape them. However, cards exiled by Robber of the Rich are only visible if the condition of having attacked with a rogue is currently met. Thus, players can't see which cards would become playable if the condition were met. In paper, these cards would be kept in a separate face-up pile, so they should be kept visible on Arena.
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NMS#23417
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