Another possible option would be to spawn particles around the block, although it would take more math to work out the specific location to spawn them in, and an animated texture, as suggested by Enny, would also work well, it just depends on what overall look you want and how much math you want to do.
You could make an animated texture(one long strip) and use it for the block
Another possible option would be to spawn particles around the block, although it would take more math to work out the specific location to spawn them in, and an animated texture, as suggested by Enny, would also work well, it just depends on what overall look you want and how much math you want to do.