Can you sacrifice a land to pay for a cost if the ability specifies 'sacrifice a land'?

When a cost requires you to 'sacrifice a land,' you must sacrifice a permanent you control that has the land type or supertype — specifically, any permanent with the subtype or card type 'land.' This is governed by CR 701.17, which defines sacrificing as putting a permanent you control from the battlefield into its owner's graveyard, and CR 117.1, which defines costs and how they are paid.

The word 'a' in 'sacrifice a land' means exactly one land of any kind unless the ability further restricts it (for example, 'sacrifice a Forest' or 'sacrifice a basic land'). As long as the permanent you are sacrificing is a land — regardless of its name, abilities, or whether it is tapped or untapped — it is a legal choice to satisfy the cost.

It is important to note that you can only sacrifice permanents you control (CR 701.17a). You cannot sacrifice a land an opponent controls, even if that would otherwise seem to satisfy the cost.

Example: Your opponent controls Strip Mine and activates its ability: 'Sacrifice Strip Mine: Destroy target land.' The cost 'Sacrifice Strip Mine' requires them to sacrifice Strip Mine itself — a land they control — which is perfectly legal. Similarly, if you have a card saying 'Sacrifice a land: Draw a card,' you could sacrifice your Swamp, your Tropical Island, or any other land you control to pay it.

So yes, any land you control can be sacrificed to pay a cost that reads 'sacrifice a land,' unless additional restrictions narrow the eligible choices.