Neroth, The Grave Knight

Menace When Neroth attacks, you may pay {x}. If you do, exile X creature cards from all graveyards and put X +1/+1 counters on Neroth. {2}{B}, Remove X +1/+1 counters from Neroth: Create X 2/2 black Skeleton creature tokens with decayed and “When this creature dies, mill a card“.{/color#ffffff}