Cthulhu's High Priest

When Cthulhu's High Priest enters the battlefield, search your library for any Octopus, Merfolk, Leviathan, Monstrosity, or Cultist
creature and put it on the battlefield tapped.
{u}{b} Willing Sacrifice
{t}{b} Put one madness counter on yourself, after
your draw step, for each madness counter you
have add one {b} to your mana pool and discard an
equal number of cards from the top of your
library.