Q: When does [this set] rotate out of [this format]?
A: The Standard format rotates with the release of each successive Core Set and with the release of each large expansion in the fall; the oldest block in the format (or the Core Set) rotates out in its entirety at the same time the newly-printed large expansion or Core Set becomes legal. Coldsnap, as a special case, will rotate out of Standard with Time Spiral block this October. Nothing will rotate out of Standard with the release of Shadowmoor, as the Lorwyn and Shadowmoor "miniblocks" count as one extra-large block for rotation purposes. Tenth Edition will rotate out of Standard in the summer of 2009, and Lorwyn and Shadowmoor blocks will rotate out of Standard together in October 2009.
From the Magic General FAQhttp://forums.gleemax.com/showthread.php?t=982291
Yes it is beautiful but it is more usefull to express it: e^(iPI)=-1