Bottled Cloister

At the beginning of each opponent's upkeep, exile all cards from your hand face down.
At the beginning of your upkeep, return all cards you own exiled with this artifact to your hand, then draw a card.

Ravnica Remastered

At the beginning of each opponent's upkeep, exile all cards from your hand face down.
At the beginning of your upkeep, return all cards you own exiled with Bottled Cloister to your hand, then draw a card.

Ravnica: City of Guilds

At the beginning of each opponent's upkeep, remove your hand from the game face down.
At the beginning of your upkeep, return all cards removed from the game with Bottled Cloister to your hand, then draw a card.

Errata’d to make it clear that only the cards you own go into your hand, so if you somehow gain control of the Cloister, your opponent’s cards won’t go to your hand.