The Dark Magicians

The first time a spell is cast on any opponent's
turn, draw a card, then you can reveal it until
your next turn if it is a black wizard creature or
a black non-creature non-land card. You may
cast that card on your next turn without paying
its mana cost.
When this card enters the command zone, you
may put up a black wizard creature from your
graveyard onto the battlefield.