Klaus, Misanthropic Savant

Menace
When Klaus, Misanthropic Savant enters the battlefield, create Serinkh, a legendary 3/3 colorless Mutant Horror Creature token with deathtouch and “Whenever this creature deals combat damage to a player, that player discards
a card.”
{w}{b}, Sacrifice a creature: Target opponent sacrifices a creature and loses life equal to the sacrificed creature's toughness.