Heir to the Ashes

Fading 2 (This creature enters the battlefield with
two fade counters on it. At the beginning of your
upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Whenever an Aetherborn you control dies, each opponent sacrifices a creature.
The unnaturally shortening of Aetherborn lives has produced a society obsessed with the mechanisms of mortality.