Board Thread:Game Discussion/@comment-9204520-20130621190525/@comment-10479663-20130622011346

while the individual probability stops increaseing at tier 6, if you had failed to see one at the 6th puchase, then the probability that you would go another 10 cards without seeing an ultra rare will drop - thats why the odds continue to increase. Please note that this assumes that you have just had terrbile luck and not gotten one on the first 6 tiers, if you did get one lets say on tier 4 - then you would reset your counter.