Zasha, Double Agent Thief

As Zasha, Double Agent Thief enters the battlefield, an opponent of your choice gains
control of it.
Whenever a creature you control attacks Zasha's
owner, put a -1/-1 counter on it. Then, you lose
1 life.
{5}: Zasha's controller sacrifices it. Then, you gain control of target permanent. Zasha's owner may activate this ability.