Displayed casting cost wrong when combining generic cost reduction with "spend mana as any type"
When an effect lets you cast a card by spending "mana as if it were mana of any type", and you also have a cost reducing effect applying only to colorless mana, the modified casting cost will incorrectly appear to reduce the colored mana part of the cost as well. Apparently because the game is simply treating the entire cost as if it's colorless, rather than colorless + any color.
Ex: Cruel Cut normally costs 1B. If taken from my opponent via Outrageous Robbery and cost reduced by things like Haughty Djinn, Case of the Ransacked Lab, etc., the game will say the cost is 0. However, the true cost is actually still 1 of any color (which the game does still enforce properly).