A Michael Jordan 1991 Upper Deck rookie basketball card is practically worthless. Jordan's basketball career started in 1984. His Fleer rookie card sold at auction for $100,000 on June 5, 2011, but it was graded a perfect 10 and was one of only three estimated to be of that caliber.
In 1991, Michael Jordan made his baseball debut with the Chicago White Sox. Upper Deck card #SP1 is considered his baseball rookie card. The average price on that card in 2014 is usually somewhere in the range of $7 to $20 in mint condition, although online auctions sometimes start out at tremendously inflated prices.