They're not the only team with multiple picks, although they might be the most intriguing.
The Thunder have three picks: 2nd, 12th, and the 30th
The Spurs have three picks: 9th, 20th, and the 25th
The Rockets have two picks: 3rd, and the 17th
The Grizzlies have two picks: 22nd and the 29th
I'm not against trading down, but like most people, I have to know what I'm trading down for.