Necromancy

You may cast necromancy as though it had flash.
If you do, sacrifice it at the beginning of the next
end step.
When Necromancy enters the battlefield, it
becomes an Aura with "enchant creature put onto
the battlefield with Necromancy." Put target
creature card from a graveyard onto the battlefield under your control and attach Necromancy to it.
When Necromancy leaves the battlefield, that creature's controller sacrifices it.