I think Muscle Band is better than Silver Bangle here--or it's at least strong enough to justify running a mix. A Banded Thundurus is a huge threat early game, spreading considerable damage while setting up Kyurem. As for Supporters, I agree that N is essential, and I'd recommend a third Colress. With so many Basic Pokémon and Balls to search them out, it's rarely a dead card. I don't think you need more than a single Shadow Triad here. You don't run Genesect, so Red Signal isn't a factor, and you have high enough counts of your other cards to get away without a recursion effect, I think. Have you considered a Lugia-EX? With Scramble Switch in the deck, it seems like a nice tech and an easy way to finish off a game. Spread some Frost Spear damage onto Pokémon-EX, Scramble Switch into Lugia, drop a Muscle Band, and win.