When selecting colours, there should be the option to filter by casting cost only. At the moment, if you select green for example, you have to scroll through 2-3 pages before you actually get to green cards (rather than other colour cards with a green ability).

There should also be an excluded non selected colours to make looking at gold cards easier. Selecting something like WBG gives me every colour pair bar UR (although if this could not exclude hybrid cards, that would be great)