Michael Rubin -- who created the now-viral All In Challenge -- thinks Tom Brady's about to draw a 7-figure donation to the cause, and says that's still a bargain for one lucky, rich fan!!!
The 76ers partner came on ''TMZ Live'' Monday with updates on some of the big ticket Challenge auctions closing this week -- including G.O.A.T.s like TB12, Magic Johnson and Meek Mill.
While Michael is thrilled the All in Challenge has already raised $20 million, he's hoping to reach $100 mil in donations to feed families during the pandemic.