Sekera for a 1st in either 2015 or 2016. Had the Kings made the playoffs in 2015, they give up the 2015 pick, and who cares. But because they missed, they kept the 2015 pick(because it was a lottery pick in the McDavid draft), and it gave Lombardi an asset to work with. Heading into the 15-16 season, the Kings would've had no pick. So, he went and traded the 2015 pick(after the lottery) for Lucic, because you still have the majority of a 2 time champ coming back, and you get only so many realistic kicks at the can. The Kings ended up with 1 playoff win in return for 1st round picks in 2015 and 2016. Most blame the Lucic trade in and of itself, but the path started earlier.
Of course if Voynov doesn't do what he did, Sekera is likely never traded for, and who knows how things play out after that.