Here's how this tactic works:
1. sell your soul to the devils for their assistance
2. use devils' assistance to obtain political power
3. use political power to bribe or coerce others into selling their souls to the devils, thus paying off your debt, and potentially more clients.
The tactic is named after Doctor Facilier, who accomplished step 1, attempted step 2 and along the way secured additional help from agents of the devils by promising to do step 3, but never actually made it past the first step. Other famous examples include Ratigan (who got assistance in the form of plans for an animatronic version of the Queen of the British mouse community but only briefly reached step 2 before the plan fell apart) and Scar (who got assistance in the form of charisma and succeeded before his violent overthrow).