[Bug] Colored cards without mana costs

There are some cards that don't have a mana cost, but are colored.  Wheel of Fate, Ancestral Vision, Crimson Kobolds and others.

When searching your inventory/tradelist/wishlist or the card database and filtering by color, those cards do not appear.
For example, If I search for "Wheel" and specify Red cards, Wheel of Fate will not show up.