Champion of Stray Souls

Oracle Text

3BB, T, Sacrifice X other creatures: Return X target creature cards from your graveyard to the battlefield.

5BB: Put Champion of Stray Souls on top of your library from your graveyard.

Card Rulings

2/1/2014 You choose the targets of the first ability as you activate that ability, before you pay any costs. You can’t target any of the creatures you sacrifice.
2/1/2014 The last ability can be activated only if Champion of Stray Souls is in your graveyard.