Animate Dead

Enchant creature card in a graveyard
When Animate Dead enters the battlefield,
if it's on the battlefield, it loses "enchant
creature card in a graveyard" and gains
"enchant creature put onto the battlefield
with Animate Dead." Return enchanted
creature card to the battlefield under your
control and attach Animate Dead to it.
When Animate Dead leaves the battlefield,
that creature's controller sacrifices it.
Enchanted creature gets -1/-0.