Fathomtide Leviathan

Ingest (Whenever this creature deals combat damage
to a player, that player exiles the top card of their
library.)
{4}{u/b}: Target player puts the top four cards of
their library into their graveyard. You draw a card
for each creature card put into that graveyard
this way.
It lurks deep within our minds, preying on our
thoughts and imaginations.