Rafi was shot to death by Dirty Randy in the 5th season. He wakes up and then is shot again by Dirty Randy 5 minutes after his resurrection.
Although Ruxin makes reference to his brother-in-law in the first season outtakes, Rafi makes his first appearance in the Season 2 opener "Vegas Draft." After Vince leaves the League, Ruxin invites Rafi to join. Despite the fact he seems not to know what the Draft board is and, according to Taco, has a visible penis beard, the League choose Rafi over Jenny as the new eighth man.
By "Bro-lo El Cordero", the League have started to resent Rafi.
As Rafi remarks to Jenny, "it's a numbers game for me." ("Vegas Draft")