Christmas themed Corki

could be riding a flying reindeer. He could be a Santa or an elf.

His Q i don't really know what to do with, but when it shines it could be the northern lights (kinda).

For his W, could have snow or hail or ice fall or the reindeer's hooves falling off? IDk

When he uses his E it could be the reindeer's nose, which is red, and beams of light shoot out from it.

For his ult, it could be him holding his sack towards the enemies and a present shooting out of it. Upon impact confetti could burst from the present.