Sunken Hollow (Surge Foil)

Land — Island Swamp

(T: Add U or B.)
Sunken Hollow enters the battlefield tapped unless you control two or more basic lands.

"So, we are fighting an unknown homicidal force that has taken the form of your commanding officer and a cowardly alien, underwater, in a nuclear reactor. Anything else I should know?"
—The Twelfth Doctor