Harrowhark, Ninth Adept

Skeletons you control gain indestructible and get
+1/+1
Harrowhark gets +0/+1 for each skeleton you control.
Whenever a creature dies put a number of Bone counters equal to its toughness on Harrowhark.
{x}, Remove X bone counters, {t}: create X 1/1
Black skeletons
"Show them what the Ninth House does."