Won't happen. Middling relievers are not that expensive. If a deal is made, it will be similar to the Archie Bradley deal where a seller basically gives away a reliever to save a little cash. Look at that deal the Marlins made.. They gave away a reliever since the other team absorbed the contract of an older OF.
The fact that our ownership will probably not allocate any money at the trade deadline, combined with Krall's incompetence, lack of creativity , and aversion to risk will mean most likely.. no deal happens at all. I hope I am wrong.. But honestly, they've waited far too long to address the pen. Even if they made a deal tomorrow, it would most likely be "Too little, too late". They should have been working the phones and fixed this before June.