Ryaliek (Absolute Death)

Soul Harvest (Whenever a creature dies put a
+1/+1 counter on Ryaliek)
Death's Authority (If Ryaliek would be removed
from play, return Ryaliek to the battlefield at the end
of your next turn)
Extinction- {4}{b}{b},{t}: Choose a creature type,
then exile all creatures of the chosen creature
type in play and all in graveyards.