I was inputting a bunch of cards I just acquired and several of them return no results in the import sectrion.

Teron Gorefiend Timewalkers 19/30 - Green
Mannoroth the Destructor Timewalkers 24/30 - Green
Sigil of the Legion Betrayal 61/202 - White
Elistari Silverwind Betrayal 67/202 - Green
Wrathguard Defender Betrayal 165/202 - White

They are a little behind in updating the WoW sets. Basically nothing from block 7 is in the database at the moment.