The Necessary and Proper Clause is as follows: The Congress shall have Power ... To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof.
The "then" should be changed to than and "myself" should be changed to me
Explanation:
Than is used when you're talking about comparisons; then is used when you're talking about something relating to time. And "me" sounds grammatically correct.