For those talking about event ninjas from rng, I raise you the luckiest dude from my server. So for a total of around 8k coupons he got: Jonin Minato, Masked Man, Kage Minato, Shisui, Shark Kisame and Edo Deidara. Needless to say that any of this ninjas alone outside rng events is worth more than 8k.