Best vaulting bonus ever

I recently realized the best way to gather vaulting bonuses for Packrat. When you vault, if you have more than 5 cards remaining in your pack after vaulting, you receive one new vaulting bonus card in your pack.

If, however, you have fewer than 5 cards in your pack after vaulting, you will receive up to the five card minimum in your pack.

So, vault all of the cards currently in your pack (five being the easiest to vault, but, really, as long as it's all of the cards in your pack):

and you'll receive FIVE new vaulting-bonus cards:

including those extra special really awesome double headed serpent bonus cards. Whoo!