Chaos Convoker

Convoke, Trample, Doublestrike, Ward {3}
Each permanent that was used to cast this spell
gets put on the bottom of your library. Then for
each permanent returned this way reveal cards
from the top of your library until you reveal the
same number of permanents. Put those
permanents onto the battlefield under your
control and the rest on the bottom of your library.
Then shuffle your library.