The XP Boost card is a simple yet helpful card. If you're eyeing a mission that you need more levels for then the XP Boost cards are for you!
XP Boosts not only increase the amount of XP you earn for completing missions, they also increase the maximum number of drunk fans you can find on a mission. Thus XP Boost and Risky Whiskey combo well together, allowing you to store a higher number of drunk fans! XP Boost cards can be found in +10, +50 and +100 varieties.