Warden of corpses

As an additional cost to cast warden of corpses, sacrifice a creature warden of corpses enters the battlefield with x +1/+1 counters, where x is twice the sacrificed creatures toughness.
{r/g}{r/g} sacrifice a creature: put x +1/+1 counters on warden of corpses, where x is that creatures toughness
{w/b}{w/b} sacrifice a creature: make x 1/1 spirit tokens where x is that creatures power