Nivram, treacherous Silence

Trample,Deathtouch
{2}{b/g}{g/u}{u/b} {t}: Target player puts the top twenty cards from his library into his or her graveyard. Nivram, treacherous Silence does not untap in your next untap step.
"Its foolish to presume that I am not a threat because I stay quiet. It is just no use acknowledging you as being worthy of my words."