Eager Young Necromancer

When Eager Young Necromancer enters the battlefield, create a skull token that says "when a creature possessing the skull attacks, deal 2 damage to any target, you gain 1 life, then pass the skull back to Eager Young Necromancer."
{t}Pass the skull to target creature you control
When the skull returns to Eager Young Necromancer, put a zombie with power 2 or less from the graveyard to play