Sere Kumha, Divine Ruler

Worship ( At the beginning of your upkeep sacrifice a creature. You gain 2 life. You get a {0}: a Worship Counter. )
Whenever another creature enters the battlefield under your control, put a -1/-1 counter on it. Each opponent loses 2 life.
{1}{w}: Remove a Worship counter: Gain 2 life.
{1}{b}: Remove a Worship counter: Put a -1/-1 counter on target creature.