Receives:
2021 1st round pick
Caleb Jones
James Neal (30% retained) - $4.025 mil cap hit
Receives:
Taylor Hall (50% retained)
Sabres Rationale: Buffalo gets a first round pick in the upcoming draft, Caleb Jones - a young defenseman with top 4 upside, and a retained Neal who they can buyout for cap flexibility in the off-season (would cost $1.3 mil against the cap for 4 years). They collect assets for Hall who likely isn't re-signing anyway.
Oilers Rationale: Edmonton gets a top 6 impact LW to slot beside Draisaitl, McDavid or Nugent-Hopkins and the cap space to re-sign him in the off-season if he is willing. They give up a first round pick, Jones (who they potentially lose to the expansion draft anyway), and get rid of most of Neal's cap hit (buyout would cost ~$570k against the cap for 4 years).