Mage: The Ascension (revised) Quickstart rules...
Why did White Wolf do this? This game is amazing? And it has nothing to with the final product. They did the same thing for 1e Exalted. They create a Quickstart rules that surprised me with its innovative attitude, simple rules, and elegant design. And then they create a "Full" version that uses an entirely different rules system.
If you want to play a "Mage" I recommend just getting this and hacking it a bit. I know I will be be working a hack of this, just like how people have created Quixalted for the Exalted game (based off of the Exalted Quickstart rules).