Lazav, the Deceptive

Lazav enters the battlefield as a copy of a
creature you control with converted mana cost X
or less, except it's name is Lazav, the Deceptive.
Sacrifice a creature: You may cast Lazav from
your graveyard this turn.
The Dimir are rarely where they are supposed to be.
In Lazav's case, he's never where he's supposed to be.