No clue how I did it the first time. I knew we held onto the trip cap but time expired in the second round. After that game I dont know if I went to bed played some more or whatever. But next day I logged on and saw I unlocked the trip cap and my friends who I played with the night prior didnt have it. So maybe I got it playing Mercenary Moshpit. But me and my buddies set out to do it and did it two times in a row. I was mad because I couldnt brag about having the cards too long.
We can try tho like I said. Me you and my 2 other buddies can hold it down but when it comes to randoms? Things can get screwed up which makes it tough.