I'm a Legacy player, but for what I've seen in modern, I never understood how such a disrupt-able and 4-freaking-mana combo like Twin could possibly be good. Then I watched some modern and realized that the main issue was that the format was too slow and clunky that you could actually get away with it. I thought with time the format would establish itself to the point where Twin would [be] close to impossible to execute. But no, the format kept being as clunky as it is. And poor Twin had to pay the price for a poorly developed format.