Ghilzar, King of the Silent

Lurk ( Whenever an opponent casts a spell with a
greater converted mana cost than this creature’s
converted mana cost you may put this card onto the
battlefield. )
Whenever a creature you control with Lurk
enters the battlefield during an opponents turn
you may discard a card with lurk, if you do, look
at target players hand and choose a card, that
player must cast that card this turn, if that player
does not, that player loses 5 life.