I just noticed that it is apparently not possible to search for multicolored cards with a specific color combination (e. g. red-white cards) which makes searches in a gold-card intensive set quite daunting and less helpful.

My most common searches are of the type "green-blue creature with converted mana cost 3 to 5" and not feasible.

In a specific set, the visual spoiler might help. That's sorted by colour pair.

You're right, though, the search capability could do with more enhancements in this area.