Caw-Blade was so dominant that both Jace, the Mind Sculptor and Stoneforge Mystic were banned in Standard, which was a huge deal at the time, when Standard bannings happened about once every decade rather than once every three months
I've played with and against this deck, and it's always struggled to keep up with the pace of the game and to have any meaningful impact
You can choose from three options: Amber and Amethyst, Emerald and Ruby, or Steel and Sapphire, or you can buy all three as a bundle
The good news is that you get to keep the sword
Free cards or spells cast is powerful, and she churns cards and card advantage powerfully, so folks load her deck up with cheap or free cards with big costs, like Peregrine Drake or Palinchron as well as tons of instants, like the free Snap or Frantic Search, and such