Spinerock Knoll

Hideaway 4(When this land enters the battlefield, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
Spinerock Knoll enters the battlefield tapped.
{t}: Add {r}.
{r}, {t}: You may play the removed card without paying its mana cost if an opponent was dealt 7 or more damage this turn