Spectre vs. Mr. Mxyzptlk

Who wins? Spectre does not know that Mxyzptlk gets sent back if he says his name backwards.

Mxy.

Hasn't Mxy already owned Spectre before?

Regular Spectre, or Spectre backed up by The Presence

Backed up by Presence but in this battle, Mxyzptlk has to be fighting for his own life, not just for tricks or pranks. he's really trying to kill Spectre.

Spectre wins.