Mergo's Loft Middle

{t}: Add {u} or {b}.

{t},{2}{u}{u} : Target a land. You may activate
any of its abilities by paying their costs and fulfilling their conditions. If so, at the beginning of your upkeep, put the targeted
land in your exile. You may activate this ability only once per game. You can activate this ability without paying its cost if Mergo’s Loft Middle leave the battlefield.