While it might be Robert Downey Jr.’s 50th birthday today, it turns out that he’s the one giving away presents. In a new video posted to his Facebook page, the Avengers: Age of Ultron star announced that he is giving away his own personal Iron Man Mark 42 figure to raise money for charity.

In the video, Downey Jr. jogs away from his sports car and says, "In response to people who say ‘Robert, why don’t you just help Julia’s House get to the two million dollar mark on the Omaze thing?’"

Then, Downey Jr. jokes, “Well, first of all, I’ve fallen on hard times,” before revealing that anyone who donates in the next 72 hours will have a chance to win his own personal Iron Man Mark 42 figure.

GAME CHANGER. If you donate $10 or more in the next 3 days to help us reach our $2m goal, you'll ALSO be entered for a chance to win my own personal Mark 42. #nerdgasm Enter here: https://bit.ly/WinMark4 Posted by Robert Downey Jr on Friday, April 3, 2015

If that wasn't enough, Downey Jr. offered up one more enticement to donors. Downey Jr. wrote, "If we reach our $2m goal by midnight on Monday, all donors will find a NEVER BEFORE SEEN CLIP from Marvel’s Avengers: Age of Ultron in their inboxes on Tuesday."

For more information on how to support Julia's House and potentially get the opportunity to hang out with Robert Downey Jr. at the Avengers: Age of Ultron premiere go to Omaze.com.