This is an element that would help us a lot to find specific creatures in the Troops tab in the game.
When we select a mana color on the filter, we see all the combinations it has. For example, if we select Yellow, we see all creatures that use only Yellow Mana, as well as those using Yellow / Green, Yellow / Blue, Yellow / Red, Yellow / Brown, and Yellow / Purple.
However, if we select Yellow and Red we see all creatures that use only Yellow Mana and all that use only Red Mana, as well as all combinations for these two types of colors, leaving much more complicated than just looking one color at a time .
It would be much more practical if we selected two Mana colors, for example, Yellow and Red, the game would only show us the creatures that have these two colors in their Traits, that is, only creatures with Arcane Storm.