Note: this mod covers most units from League of Explorers and previous, but there are probably still some that I missed. Sorry!
Hearthstone is a digital card game that takes place in a dystopian realm where even powerful wizards cannot always summon enough cloth to make a whole robe.
This mod goes some way toward alleviating such destitution, by replacing the artwork on certain cards with artwork from other cards. Most of the original cards have been dealt with, though subsequent updates may render make this mod somewhat out-of-date in the future.
Note: this mod contains a script that modifies game files to swap out the artwork on some cards. While the changes are entirely cosmetic, it may technically be against the ToS. So to be safe, you could probably just play something else instead. =PModesty Go!
P.S. Be advised that (depending on your automatic update settings) you will probably have to double-click the mod script each time you launch the game. See the readme for details.