My suggested blow it up trades:
Lowry to Denver for Wilson Chandler, Kenneth Faried, Trey Lyles and their lottery-protected 2019 1st round draft pick.
For Denver: They need a veteran point guard. Murray and Harris are studs but neither is a real point guard. This gives them a solid 3-guard rotation with a complete skill set. They have been trying to dump Faried for years. They should be a playoff team next year with this trade.
For Toronto: Chandler is a 3+D wing when healthy, and they have shown interest in him and Faried in the past. Lyles is a Canadian stretch 4. All 3 guys are free agents after next season so it's an audition year for both sides.
DeRozan to Memphis for their lotto pick (#2 pre-lottery) and Chandler Parsons
For Memphis: If they aren't going to trade Gasol, they might as well trade this pick for a mid-career All-Star that can help them make a run. DeRozan doesn't have to be a leader on a team with Gasol and Conley, and can just help them by putting up points.
For Toronto: A high lottery pick is the ultimate asset when rebuilding. Acquiring one without having to tank is highly valuable. Eating the Parsons contract hurts but the pick will be high enough to justify it.
Ibaka to the Blazers for Harkless, Leonard and their 1st round pick (24th overall)
For Portland: Their frontcourt sucks, Nurkic is a free agent and they have soured on Leonard. Ibaka gives them the rim protector they lack.
For Toronto: Harkless gives them another big wing defender, and Masai gets another swing in the draft in the same area he got Delon and Siakam (and Bruno). Eating Leonard's contract is the cost of doing the deal.