Rob Kardashian is ON FIRE -- the sports card collector just pulled an ultra-rare Honus Wagner autograph ... and the video is epic!
Here's the deal ... Rob K. has established himself as one of the top dogs in the high-end sports card market -- often buying boxes of pricy, rare cards in the hopes of hitting big.
AND HE KEEPS HITTING BIG!!!
This time, Rob paid $750 for a chance at the contents of the BullPen BullChest at the Bullpen card shop in L.A.
Basically, 6 people pay $750 each to split the contents of the "BullChest" which is loaded with expensive PSA graded cards, boxes of unopened cards .