Heathcliff, Enigmatic Noble

Morbid - When you cast Heathcliff, Enigmatic
Noble, if a creature died this turn, draw a card.
Sacrifice three Humans you control: Exile target creature.
When Heathcliff attacks, Uncover 2. (Look at the
top two cards of your library, then put any number of
them into your graveyard and the rest on top of your library in any order.)