Circe, The Puppeteer

Eminence — Whenever a creature enters the battlefield under an opponents control, if Circe, The Puppeteer is in the command zone
or on the battlefield, that opponent flips a coin. If they lose the flip, that creature becomes a 1/1 pig token and loses all abilities.
{3}{g}: Search your library for a creature card with 5 or more power and put it into your hand. Then return target creature to an opponents hand.