Tenser's Floating Disk to get a bunch of mules across an icy crevasse in the middle of a blizzard.
Of course, the crevasse was large enough that the cleric had to climb out on a rope in order to get the distance right... and after the last mule was across he fell. But up until that point it was a really good idea.
Of course, the crevasse was large enough that the cleric had to climb out on a rope in order to get the distance right... and after the last mule was across he fell. But up until that point it was a really good idea.