One thing that really annoys me about these "colour indicators" is that they aren't mindful of people with colour blindness, while the earlier system of flat-out stating in a card's text what colour it is, if it isn't obvious from the mana cost, was.
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You: "I can kill your creature as soon as it attacks"
Opponent: "Bullexcretion! You have no lands left untapped!"
You: "EXACTLY!...."
-Swag_Crow