Despite being abandoned for millennia, the Thran ironworks still occasionally sputter to life.

Steam Vents

({T}: Add {U} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Ravnica: Clue Edition

As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Ravnica Remastered

({T}: Add {U} or {R}.)
As Steam Vents enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

If an effect puts this land onto the battlefield tapped, you may pay 2 life, but it still enters tapped.

Unlike most dual lands, this land has two basic land types. It's not basic, so cards such as District Guide can't find it, but it does have the appropriate land types for effects such as that of Drowned Catacomb (from the Ixalan set).

Secret Lair Drop