Y'Golnac says
Action : Pay 1 to choose and ready a character. That character must commit to the same story as Y'Golnac, if able.
Binding Worm says
Characters cannot commit to stories alone.
So let's say I've got Y'Golnac and Binding Worm in play. My opponent has at least 1 ready character and at least 1 other charcter.
I pay 1 on Y'Golnac to make one of my opponents characters commit to Y'Golnac's story, and my opponent has another ready character.
Does my opponent have to send the targeted character and another one to the story ("must commit... if able", and the only way to be able to commit is to send two?), or can my opponent ignore Y'Golnac's ability because a character cannot commit alone?