There is some strange behaviour when using the Subtype filter. When filtering by a subtype, using any of the following filters will have no effect on the search results:

-Rarity
-Oracle Text
-Card Name
-Flavor Text
-Artist
-Converted Mana Cost

The other filters (Suptertype, Type, Color, Power and Toughness/Loyalty, and Format Legality) still seem to work fine. I've included an example which has the affected filters all set to something that should return zero results, such as searching for "asdfasdf" in the oracle text. Yet results show up (they are visible in the background) as if I had not used those filters at all.