Full Mojo Rampage had Steam trading card support added on October 28, 2013. There are 6 cards in the set, 3 of which you'll receive for purchasing and playing the game.
Trading Cards
Foil Trading Cards
Badges
Level 1
Voodoo Follower
Voodoo Follower
Level 2
Voodoo Warrior
Voodoo Warrior
Level 3
Voodoo Summoner
Voodoo Summoner
Level 4
Voodoo Protector
Voodoo Protector
Level 5
Voodoo Priest
Voodoo Priest
Emoticons
Profile Backgrounds