Spinerock Knoll

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