Nyx, Night's Hunger

{3}{u/b}{b}{b}: Create a token that is a copy of target artifact, enchantment, or creature.
{x}Put a +{x}/+{x} on target creature.
When Nyx, Night's Hunger dies, create a token that is a copy of Nyx, Night's Hunger. Return Nyx, Night's Hunger to the battlefield under your control.