Puppeteer Leech

When Puppeteer Leech enters play, attach it to
target creature an opponent controls. As long as
it remains attached, you control attached creature. If attached creature leaves play, attach Puppeteer
Leech to another creature an opponent controls.
If there are no valid targets, Sacrifice Puppeteer
Leech.
{b}{b}: Attach Puppeteer Leech to a different
creature; the formerly attached creature returns
to the control of its owner.