Dr.Doom vs Hulkbuster(s)

VS

Doom in his regular everyday" just feeling like Doom" Armor vs The HulkBuster armor. Or in How many HB's would it take to put Doom down.
Doom gets no prep. Fight takes place in his daisey and puppy garden outside his Latverian Castle.

616 Doom and HB.

With his armor plus magic, I don't know how many HB's it would take to put him down, but I can say it sure as hell will take more then 1.