Voracious Nightstalker

Menace, Discord 1(This spell costs {1} more to cast
for each creature on the battlefield.)
Supremacy 1 (Whenever a creature dealt damage by
this creature turn dies, put a +1/+1 counter on this creature.)
At the beginning of your upkeep,sacrifice another
creature. If you can't, tap Voracious Nightstalker
and it deals 5 damage to you.