The Puppeteer

As The Puppeteer enters the battlefield, choose a player. As long as you control this card, you
control chosen player on each of that player's
turns.
{t}: Lose three life. Gain control of The
Puppeteer, then choose a player. As long as you
control this card, you control the chosen player
on each of that player's turns. The Puppeteer
doesn't untap during its controller's next untap
step. Any player that does not control The
Puppeteer may activate this ability.