Crystal Lotus

{t}: Add three mana of any one color.
{1}, {t}: Exile target land. You may play it for as long as it remains exiled.
{3}, {t}: Exile up to 5 target lands. Return them to the battlefield under your control. They become artifacts in addition to their other types.
{7}, {t}: Exile all lands your opponents control. Create a 1/1 colourless Servo artifact creature token for each land exiled this way.