Robespierre, Regicidal Prophet

Whenever a nontoken creature you control dies,
your life total can't change this turn.
{b},{t}, Sacrifice another creature: Detain target
artifact, creature, or Planeswalker.
{r}{r},{t}, Sacrifice another legendary creature:
Put a vigilance counter, lifelink counter, and first
strike counter on each other creature you control.
The king must die so that the country can live.