Necromancy

You may cast Necromancy as though it had flash;
if you do, sacrifice it at end of turn.
When you play Necromancy, choose target
creature card in any graveyard. When
Necromancy comes into play, put that creature
into play as though it were just played and Necromancy becomes a creature enchantment
that targets the creature. If Necromancy leaves
the battlefield, sacrifice the creature.