Valslay, the Forgotten King

Eminence - As long as Valslay, the Forgotten King
is in the command zone or on the battlefield,
other zombies you control have wither (they
deal damage to creatures in the form of -1/-1 counters).
Whenever you cast a Zombie spell, place a +1/+1 counter on Valslay, the Forgotten King.
{3}, sacrifice two zombies: Target creature gets
-1/-1 until end of turn, equal to Valslay, the Forgotten King's power.