Nightmare Ghoul

Vigilance trample
{5} sacrifice a creature then return all creatures in
your graveyard to the battlefield and they all have
base power and toughness 2/2 its a Nightmare in
addition to its other types
{4} put 2 -1-1 counters on all knights, humans,
rouges, and riders you may only use this ability
once
A horrific mutation of death...