Dromar's Cavern

When Dromar's Cavern enters, sacrifice it unless you return a non-Lair land you control to its owner's hand.
{T}: Add {W}, {U}, or {B}.

Dominaria Remastered

When Dromar's Cavern enters the battlefield, sacrifice it unless you return a non-Lair land you control to its owner's hand.
{T}: Add {W}, {U}, or {B}.

The List

Planeshift

Dromar's Cavern is a Lair in addition to its land type.
When Dromar's Cavern comes into play, sacrifice it unless you return a non-Lair land you control to its owner's hand.
oc
T: Add o
W, o
U, or o
B to your mana pool.

If you don't want to unsummon a land, you can play this card then tap it for mana before the enters ability resolves. You may then choose to sacrifice it instead of unsummoning a land.

This land is of type "Lair" only; other subtypes have been removed. It is not a basic land.