At a minimum, the Colts would need to send Philly their 2013 1st and 3rd rounders. In addition, next year's 1st rounder.
Also, the Eagles want get rid of Jeremy Maclin. He is in the last year of his 5 year rookie deal. He will be seeking a 7-10M deal. Coach Kelly wants to get rid of him, due to being a soft player and in last year of current deal. He is being proposed in the deal, and likely would be a additional 2nd rounder.
The salary cap is tight. Having high priced veterans that eat up the cap and then filling out the rest of the roster with low end salary guys.
I do not like this proposal. One is loosing future draft picks that do not cost a lot. Secondly, adding veteran's that will demand a high salary and handicap the team in the future.