Thr'Roth, Watcher of Sins

When Thr'Roth, Watcher of Sins enters the battlefield, gain control of three permanents.
When Thr'Roth attacks, gain control of target permanent.
At the beginning of your upkeep, you lose X life,
where X is the number of permanents you
control but don't own.
All hope is lost, surrender yourself to it, and you may
be given the gift of being a servant.