Erebor's Secret Door

Erebor's Secret Door comes onto play tapped.

{t}: Add {r} to your mana pool.

{t}, sacrifice Erebor's Secret Door: target dwarf
cannot be blocked untill end of turn.

"On Durin's Day, when the setting sun and the last
moon of autumn are in the sky together, the day's
last sunlight falls on the door and exposes it"