Khudal, Sultai Traitor

Whenever a creature you control is put into the graveyard from your library, you may draw a card
or have an opponent lose four life.
Whenever a creature leaves your graveyard, you may draw a card or have an opponent lose four life.
Whenever Khudal, Sultai Traitor is put into the command zone from anywhere, draw three cards.
Each opponent loses four life.