League of Legends has quietly become one of the most popular games in the entire world. The MOBA has now gotten so big that mainstream credit card companies are looking to cash in on the phenomenon.

American Express this week announced that it and Riot Games, the developer of League of Legends, have joined forces to introduce League of Legends-themed prepaid credit accounts. The accounts will have a reward system attached that can provide players with Riot Points (RP, an in-game League of Legends currency). American Express is also now the “official payment partner” for the League Championship Series and an “official partner” for the World Championship.

“Riot Games is passionate about serving their players and giving them avenues for enhancing their gaming experience” said Stefan Happ, SVP for U.S. payment options at American Express. “Together we’ve been able to create a great co-branded product with a unique rewards program that will help League of Legends players earn Riot Points whenever they use their Card to make qualifying purchases.”

The “RP+” program attached to the accounts gives players 1,000 RP for registering, 1,000 RP for putting $20 in the account, and 1,000 RP for using the cars for 10 purchases. Setting up the card with direct deposit will get players 10,000 RP. All together, players can earn 13,000 RP – more than $85 worth of RP.

Those who sign up for the card can choose from six different League of Legends backgrounds for their card. The backgrounds include art for Teemo, Vi, Lux, Twisted Fate, the Summoner’s Cup, and the League of Legends logo.