Caw-Blade was a standard deck, derived from a deck created by Brian Kibler named Caw-Go. Caw-Go itself was a play on words of a control archetype named Draw-Go, basically saying you draw your card and pass your turn, holding counterspells in your hand.
Brian Kibler's deck only had 4 creatures, all Squadron Hawks, which is where the "caw" in which caw-go derived. The deck used counterspells like Mana Leak and Spell Pierce, planeswalkers like Gideon Jura and Jace, the Mind Sculptor, and then removal such as Day of Judgment, Journey to Nowhere, and Condemn to control the opponent and the board.
With the release of Mirrodin Besieged, Sword of Feast and Famine was released. This card would be placed as a one-of in the caw-go decks, along with 4 Stoneforge Mystics, bringing the creature count to 8. The Stoneforge Mystic would search up a Sword of Feast and Famine, then cheat it into play with its ability, meaning it could not be countered. The sword would then be equipped to the Squadron Hawk.
Then with the release of New Phyrexia, Batterskull was released, along with Sword of War and Peace. These two cards broke the format. The deck was deemed too powerful, since no deck really stood a chance against it in the metagame, so Jace, the Mind Sculptor and Stoneforge Mystic were banned from standard play.