So there are 68 Ultra rare cards in the game excluding the promos Firedancer, Harvester and Lord Cyrian. Therefore we have to open 348,71 boosters on average to have all 68 Ultra rare cards. If we want all the charges too we have to open 1394,87 boosters on average. So even if we could get 3 boosters a day that would take us 464 days to get a complete collection excluding promos and completly ignoring the auction house.
Happy grinding everyone. :-)
I personally looking forward to it.