To whom that needs a second tier pitcher that loses focus when the game isn't on the line? Let's be honest, he's not that good so you have to find a team that wants what he is. Now look at the rosters of contending teams and ask which need a reliever or second tier closer as a rental.
Dodgers? Nope, they are stacked in relief pitchers. So are the Padres, Giants are in great shape, Brewers are in good shape, Mets are ok but not great, the Reds bullpen is bad but they are a bottom feeder wild card team. So you have the Mets as a possible in the NL.
Red Sox are set, Rays are awesome, White Sox could raise their floor but have 3 guys better than, A's are good, Seattle could use help, Yankees over paid for Heaney, Blue Jays could use a second tier reliever but they have as much chance at the playoffs as the Angels so they are not taking a shot at the dark. You really want to you could put Houston in the mix. So you really only have the Astros or Seattle that is fringe competitive. So really only one team in the AL.
When you boil down who needs a rental you basically have two teams, the Mets and Astros. The Mets blew their trade chip on Javier Baez because they are the Mets. The Astros picked up Phil Maton for their bullpen, kind of a silly trade.
So all the talk of trading Raisel is like mice agreeing they should put a bell on the cat but no one has a plan to do it.