That depends on what you mean. Do you mean strategies for gameplay? Or do you want to build a field board to play on? I can answer both, but just specify.
All your attackers have to be declared at the same time, before a response is made, and before the opponent declares blockers. You are not forced to make all your monsters attack, but any that you...
Magic the Gathering set symbols.
On all magic cards from "Exodus" (circa 1999) to present, there is a small symbol at the bottom right of the illustration that signifies what set a magic card is...
If you mean the standard Block Sets, that would be the Zendikar Block.Zendikar, WorldWake and Rise of the Eldrazi.M11 is due to be released July 16 2010.