The Ikoria release of Arena (2020-04-16) breaks the card importer in two ways:
They've removed the isCollectible field from the data files. I haven't found a replacement yet :-(
One (and only one) card (grpId 73649, which I think is the premium skin of Mysterious Egg) is missing the CollectorNumber field. Looking at its location in the file, it fairly obviously should be 385.
The Ikoria release of Arena (2020-04-16) breaks the card importer in two ways:
isCollectible
field from the data files. I haven't found a replacement yet :-(CollectorNumber
field. Looking at its location in the file, it fairly obviously should be 385.