Myrthikir, the Plague Doctor

Partner with Herwest, Mad Scientist
When Myrthikir enters the battlefield, you may
search your library for a card with Blight, Plague,
or Pox in its name, reveal that card, then shuffle
your library and put that card on top of it.
{b},{t}: Put a -1/-1 counter on target creature.
{4}{b}{b},{t}: Each player loses 1 life, discards a
card, sacrifices a creature, then sacrifices a land.