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.Some lands deserve the same urgency as a threatening creature. Wasteland answers a nonbasic land from a land slot, sacrificing itself to destroy the target. That gives decks a way to disrupt an opposing mana engine, remove a utility land that blocks their plan, or break up a land-based combo without holding a dedicated removal spell.
Cabal Coffers, Gaea's Cradle, and a developing Dark Depths setup illustrate why the ability matters. Wasteland can also produce colorless mana while you wait for a target worth the exchange. You are trading one of your own lands for theirs, so using it on an ordinary dual land is a different decision from removing a land that generates several mana or threatens a win.
Life from the Loam and Crucible of Worlds can recover the sacrificed land and support repeated uses. That plan still needs land plays and sufficient colored sources to keep your own deck functioning. A three-color opening hand may be less stable with Wasteland than with a colored land, even if the disruption is valuable later. Time the activation around the actual threat: destroying a land does not undo mana already produced or counter an ability already activated. The best exchange prevents the opponent's next productive use while leaving you with enough resources to follow through.
