Cursed Friend

When Cursed Friend enters the battlefield or switches control to a new player, target player,
who is not the controller of Cursed Friend,
becomes its Friend. You can't attack the Cursed Friend's Friend.
At the beginning of your upkeep, sacrifice
another nonland permanent. If you do, switch
control of Cursed Friend to target player. If you
can't, you lose 3 life.