What cards are best to collect so that you can easily win caravan? Thanks for anyones help

You want a deck that's mostly 6s, 8s, 9s, 10s, and Kings, with maybe a couple Jacks just in case. You also want the numbered cards to be only two suits (though ideally one). With this you can make 26 with six different three-card combinations. This is basically the deck I've kept all game and I'm undefeated except for the few games I threw for the achievement.