2/1/2014 
To choose a pile at random, each pile must have an equal chance of being chosen. There are many ways to do this, including assigning each pile a number and rolling a die. 
2/1/2014 
You may put Auras or Equipment into one pile and the creatures they were attached to into a different pile. 
2/1/2014 
If you put all permanents you control into one pile, youâ€™ll have a twothirds chance of not having to sacrifice any permanents, but a onethird chance of having to sacrifice all of them. 
