Sydney has received pick No.56 in return for trading Cameron and pick No.62 to Collingwood.
"We have been keen for some time to add to our group of ruckmen and Darcy is someone we identified as a good fit for our squad," Collingwood list manager Ned Guy said.
"We like his marking ability and think that, apart from time spent on the ball, he can develop into a presence in front of the ball. Darcy has the instincts of a natural footballer. I think he will give Nathan and the coaching group real flexibility."