The Celestial Toymaker

Whenever The Celestial Toymaker attacks, look top three cards of your library. Exile any number of them in a facedown pile and the rest in a faceup pile. Defending player chooses one of those piles. Put that pile into your hand.

At the beginning of each end step, each opponent loses 2 life for each spell or ability that caused one or more player to guess or to group cards or permanents into a pile this turn.