Forget all that namby-pamby stuff about searching your library! The real power of the Grozoth lies here:
"4: Grozoth loses defender until end of turn."
That is the single most intimidating ability in the history of Magic. Try it sometime: just point at an opponent who is giving you grief and then calmly indicate the tell-tale LACK of Defender on your Grozoth. They frequently get the point without having to resort to any uncivilized combat.
The normally passive Grozoth answers to only one man...
That man being one Shane Stoots, who managed to Squelch, Interdict, AND Bind Grozoth's puny attempts to lose defender. My Post: DEFECED!
Darksteel Kevin loses defender.
-Jacob