Here's a combo I ate in an online match recently. Tested only vs. Ragna and Tsubaki right now. It starts out similarly to Challenge Mission 6. The relaunch leading to the second j.214D is what made it interesting to me.
4 charges, 50 meter, 30 hits, midscreen, 5398 damage:
22D > 6CC > hjc(9) j.C > dj(8) j.C > j.236D > j.214D > (land) jc j.B > j.C > dj.CC > j.236A > j.214D > (land in corner) 2C > 236236C
Also, who are the best characters to test against for hitbox testing?