December 2017
Witch's familiar when summoned through another card doesn't get aquatic even though card description says it should. It just plain can't be played in water. Probably a bug since this was recently updated to be aquatic.
December 2017
I think this will have been sorted when the cards are nerfed from the latest changes. I don't know date of nerfing, perhaps it will be at season end? Or when the new cards are released? Either way, they are aware, and it's resolved, just needs to be updated to implement the fix.