Misava, Gardener of Greif

Whenever a nontoken creature you control dies,
create a 0/1 plant zombie creature token called a
Skull with "{t}: Sacrifice this creature and add one
mana of any color"
{g}{b}{t}: Sacrifice a Skull, create a 2/2 zombie creature token with deathtouch and haste
The Bone Orchard venerates the most powerful form
of life: Death