Clippers get younger, replace Harden with a shifty playmaking guard who could fill his role.
Harden lifts Cavs' ceiling (though idk if it's enough to win a chip), would do wonders with Mobley and Allen as his pick-and-roll partners. Also acquires MBIII in the trade, an underrated pickup as he's been playing well.
Wizards get free draft capitals for nothing, maximizes MBIII's value; also could use the help of a playmaker and vet presence of a Wizard legend (if u consider him as one)