Activate Marrow-Gnawer by tapping it and sacrificing another creature, creating at least two 1/1 Rat creature tokens.
When the Rats enters the battlefield as a Pirate due to Maskwood Nexus, Coercive Recruiter triggers twice, untapping Marrow-Gnawer, and causing you to untap any other creature and gain control of it until end of turn.
Repeat.
Results
Gain control of any number of creatures until end of turn.