There are 8 different types of wallpapers you can apply and the battery drain isn't bad but you can change the quality of it to make it drain less battery.
If you like Weather, try the Weather Now app. I use my own Pano Shot as a wallpaper. Really cool weather animations. Been using it since the S7E and on the S8+. Battery usage was noticeable but I'm getting the best battery life on my N8 even with the Live Wallpaper.