Dakhal, the Tithetaker

At the beginning of your upkeep put a Tithe
counter on target creature you don't control.
Whenever a creature with a Tithe counter on it
dies create a treasure token. That creature's
controller loses 2 life for each Tithe counter on it.
{6}{u}{b}, {t}: Creatures with Tithe counters on
them get -4/-4 until end of turn.

"Your tithe is due."