All or Nothing is a badge in Paper Mario and Paper Mario: The Thousand-Year Door. The badge allows Mario to increase his attack power by 1 upon a successfully timed action command. However, if the action command is not timed properly, it will instead drop Mario's attack power to 0.
In Paper Mario, the badge can be purchased from Rowf's shop for 100 coins, after Chapter 4 is completed. In Paper Mario: The Thousand-Year Door, it can be found in the spike trap room in the Palace of Shadow or can occasionally be found when fighting Arantulas.