Costa was cut by the Cowboys rather than accept a reduction in pay.
Costa is a 6-foot-3, 302-pounder from Maryland.
He has started 20 of 26 career games, but started no games last season after the Cowboys drafted center Travis Frederick in the first round.
Costa started every game during the 2011 season.
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Aaron Wilson covers the Ravens for The Baltimore Sun
This story originally appeared on Nationalfootballpost.com
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