They have a new effect that allows your characters to move there for a price
There are other similar things to do with other cards, but they pale in comparison to both the Dreadnaught trick and the rest of Vintage
If you find yourself up against either of these lands yourself, Gladiolus can even grab you a Wasteland to take them out
After the sacrifice, you are left with probably no hand, but with 3 characters, including at least 2 Backups
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(Some abilities can also target unexerted cards.) But not using them has less of a direct benefit - you dont need to defend your life points, as in MTG or Yu-Gi-Oh!, so leaving cards upright is typically only worthwhile if theyre likely to be challenged by your opponent and you need them for a future turn