Can I sacrifice and regenerate Augur of Skulls multiple times in the same turn?
No, that won't work
Regeneration prevents the destruction of a permanent, but sacrificing a permanent is different from destroying it:

701.16. Sacrifice
701.16a To sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent he or she doesn’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect this action.