Spinerock Knoll

Hideaway 4 (When this land enters, look at
the top four cards of your library, exile one face
down, then put the rest on the bottom.)
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.