Unheilvolle Ruinen

Sowie die Unheilvollen Ruinen ins Spiel kommen, kannst du eine Sumpf- oder Gebirge-Karte aus deiner Hand offen vorzeigen. Falls du dies nicht tust, kommen die Unheilvollen Ruinen getappt ins Spiel.
{T}: Erzeuge {B} oder {R}.

Ruinas premonitorias

En cuanto las Ruinas premonitorias entren al campo de batalla, puedes mostrar una carta de Pantano o Montaña de tu mano. Si no lo haces, las Ruinas premonitorias entran al campo de batalla giradas.
{T}: Agrega {B} o {R}.

Ruines angoissantes

Au moment où les Ruines angoissantes arrivent sur le champ de bataille, vous pouvez révéler une carte de marais ou de montagne de votre main. Si vous ne le faites pas, les Ruines angoissantes arrivent sur le champ de bataille engagées.
{T} : Ajoutez {B} ou {R}.

Rovine del Presagio

Mentre le Rovine del Presagio entrano nel campo di battaglia, puoi rivelare una carta Palude o Montagna dalla tua mano. Se non lo fai, le Rovine del Presagio entrano nel campo di battaglia TAPpate.
{T}: Aggiungi {B} o {R}.

凶兆の廃墟

凶兆の廃墟が戦場に出るに際し、あなたの手札にあり沼や山であるカード１枚を公開してもよい。そうしないなら、凶兆の廃墟はタップ状態で戦場に出る。
{T}：{B}か{R}を加える。

Ruínas Agourentas

Conforme Ruínas Agourentas entra no campo de batalha, você pode revelar um card de Pântano ou Montanha de sua mão. Se não fizer isso, Ruínas Agourentas entrará no campo de batalha virada.
{T}: Adicione {B} ou {R}.

Foreboding Ruins

As Foreboding Ruins enters, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters tapped.
{T}: Add {B} or {R}.

Duskmourn: House of Horror Commander

The Lost Caverns of Ixalan Commander

As Foreboding Ruins enters the battlefield, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters the battlefield tapped.
{T}: Add {B} or {R}.

"I love old things. They make me feel sad."
—Sally Sparrow

Doctor Who

If a Swamp or Mountain is entering the battlefield from your hand at the same time as Forboding Ruins, you may reveal the other land to have Forboding Ruins enter untapped.

If an effect instructs you to put Forboding Ruins onto the battlefield tapped, it will still enter the battlefield tapped even if you reveal a land card from your hand.

Lands don't have a subtype just because they can produce mana of the corresponding color. Forboding Ruins itself is neither a Swamp nor a Mountain, even though it produces black and red mana, so you can't reveal one to satisfy the ability of another.

You may reveal any land card with either or both of the appropriate subtypes. It doesn't have to be a basic land. For example, you could reveal Sunken Hollow from the Battle for Zendikar set to satisfy the ability of Forboding Ruins.