Forum:Forced Requisition and Iron Core deck.

If I used Forced Requisition in an Iron Core deck, would it work? I discard Iron Core of Koa'ki Meiru, so would my opponent have to do the same and discard a card? Or would it not work because I discarding is a cost? Thanks for the clarification in advance. (look under Koa'ki Meiru archtype for more in depth info)