2007-10-01 : At the time the last ability resolves, you'll get to play the card if a player who is currently your opponent, or a player who was your opponent at the time they left the game, has been dealt 7 damage over the course of the turn.

2007-10-01 : It doesn't matter how the opponent was dealt damage or by whom, as long as the total damage is 7 or more. You don't specify an opponent when you activate the ability.

2007-10-01 : You'll get to play the card even if Spinerock Knoll wasn't on the battlefield at the time some or all of the 7 damage was dealt.

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 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.

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.'”