Dark Prince of Miseries

Lifelink, menace, deathtouch
Dark Prince of Miseries costs {b} less to cast for each of the following that has occurred this turn:
•You have lost 3 or more life
•You have sacrificed a creature
•You have discarded one or more cards
{bull}An opponent has lost 3 or more life
"He is the malevolence of mischief."