Is fine, because it´s any dead, so it means "trago uma pessoa dentre os mortos por um dia."

 Indeed, to a nitpicker would mean "traga uma pessoa dentre os mortos por um dia" that, is it would be a "service" offered, but as everything in commerce, it would suggest that you is the one that "bring" him.

Other way to express that is: "Bring the dead for a day." Seems better a little bit.