Coven Transmutist

Lifelink
Elementalist — Whenever a black Wizard or a
black Elemental enters the battlefield under your control, you mill four cards. (You put the top four
cards of your library into your graveyard.)
When a creature enters the battlefield from a graveyard, you may have Coven Transmutist
become a copy of that creature, except its name
is Coven Transmutist.