Every "grab bag", "lottery", "random rare lot", whether it's here, on eBay, or anywhere else, they all have one thing in common:
Check the "odds" on this Massdrop. That isn't even a list of odds, it's a list of MTG sets each with a number listed at the end. What do the numbers mean? "That's the number of boxes out of 100." Is it? Or are you just assuming that to be the case? If it's true, how are there over 370 sold? If it's false, what's the actual total number of boxes? What if the numbers mean absolutely nothing?
Don't gamble on packs, just go buy a box of what you actually want or go buy the singles you want.