Watcher for Tomorrow

2019-06-14 If Watcher for Tomorrow leaves the battlefield before its triggered ability from hideaway resolves, its leaves-the-battlefield ability resolves and does nothing. Then its enters-the-battlefield ability resolves and you exile a card with no way to return it to your hand.
2019-06-14 You don't reveal the exiled card when you put it into its owner's hand.
2022-04-29 Any player who has controlled a permanent with a hideaway ability since a card was exiled with it may look at that card.
2022-04-29 "Hideaway N" means "When this permanent enters the battlefield, look at the top N cards of your library. Exile one of them face down and put the rest on the bottom of your library in a random order. The exiled card gains 'The player who controls the permanent that exiled this card may look at this card in the exile zone.'"
2022-04-29 Hideaway now causes you to put the rest of the cards on the bottom of your library in a random order instead of any order.
2022-04-29 Previously, permanents with hideaway entered the battlefield tapped. This ability has been removed from the definition of hideaway. Older cards have received errata to have an additional paragraph that reads "[This permanent] enters the battlefield tapped," and they now have hideaway 4.

mtg.wtf