Eruth, Paranoid Mastermind

Whenever a spell or ability an opponent controls returns two or more permanents to your hand,
you may put up to that many minus one
permanents from your hand onto the battlefield.
{u}{b}{g}{t}: Choose an opponent. That player
chooses a number of other nontoken nonland
permanents you control equal to Eruth's power.
That player gains control of this ability. Return
those permanents to their owners' hands.