What are the odds of pulling a black or black mini from one of these packs?
The pack will have a mini card in it by default. there are 350 people/things represented on the cards for that year. plus you could get an autograph as well in addition to the mini card. The mini could be red, black or silver. it could be a A&G back, black border, no number or glow-in-the-dark as well. it can't be a plain mini. if it looks plain, it is a glow one.
So, the odds not good for one of the 350. but an auto will offset the risk. or, just hold on to the pack. packs for 1999 pokemon go for a lot of money (over $1k!)