Emrakul, Sea's Current

Flying, Trample, Shroud
Whenever you cast Emrakul, Sea's Current, untap
all lands you control.
Whenever Emrakul attacks, search your library
for a Leviathan, Kraken, or Serpent and put it
into play, then shuffle your library.
If Emrakul would be put into your graveyard from anywhere, instead shuffle it into it's owners library