Düsterwasser

Das Düsterwasser kommt getappt ins Spiel.
{T}, opfere das Düsterwasser: Durchsuche Deine Bibliothek nach einer Inselkarte oder Sumpfkarte. Bringe dieses Land ins Spiel. Mische Deine Bibliothek danach neu.

Río malsano

Rivière souillée

Fiume Acquitrinoso

湿原の大河

Rio Contaminado

Bad River

Bad River enters tapped.
{T}, Sacrifice Bad River: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

Dominaria United Commander

Bad River enters the battlefield tapped.
{T}, Sacrifice Bad River: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

Vintage Masters

Bad River enters the battlefield tapped.
{T}, Sacrifice Bad River: Search your library for an Island or Swamp card and put it onto the battlefield. Then shuffle your library.

Mirage

Bad River comes into play tapped.
oc
T, Sacrifice Bad River: Search your library for an island or swamp card. Put that land into play. Shuffle your library afterwards.

Because the “search” requires you to find a card with certain characteristics, you don't have to find the card if you don't want to.