The Deluxe pack features the as well as:
* 4 Wallpapers 1600x900
* Mystland vs Mystrock Teams Hi-Res
* In-Game Scenes Hi-Res

How to find the deluxe contents

From your computer, go to:
C:\Program Files (x86)\Steam\steamapps\common
Then select the game folder.

Or directly from the Steam Client, first right-click on the game, then select:
Properties > Local Files > Browse Local Files

EXAMPLE