Sirius and the Magic Dust

It's a week before Christmas and some of Santa's elves have gotten into his Magic Dust. Now there isn't enough left to get the reindeer and sleigh off the ground, and Santa's Christmas Eve trip around the world is in danger of not happening.
Sure, Santa could make more. But that involves sunlight and the North Pole is in the middle of winter. There won't be any sun for weeks!
Sirius, a little elf with a big idea, might just have the answer to Santa's problem.