Is there a land based civ to do this with?
Light Cavalry, specifically useful with civs like Mongolia, Hungary, and Scythia, are pretty good land raiders. They have a level II promotion, Depredation, which makes pillaging only 1MP. Since coursers have 5 moves, they can pretty quickly run through a city and go to town. Depredation requires Caparison, which also helps them if you come across any pesky pikemen.
Note that the Mongol Keshig is weird and even though it uses the ranged promo tree, it doesn't have the usual penalties vs districts (iirc) nor does it get +3 from Genghis ability, but it does take extra damage from anticav. But a mobile crossbowman is still going to be amazing vs anyone.
I will also mention that cossacks are light cavalry that are unusually strong - 67

. The ottoman barbary corsair comes early @ medieval faires, can coastal raid without using
any movement, if you want some variety (and they have good land bonuses.)
But as Victoria said, nothing is going to compare with Norway's science from mines.