The Tarnished, Challenger

0: Pay X life, add that many loyalty counter to The Tarnished, Challenger. Then mill X cards from the top of your library.
-X: You may play target creature with converted mana cost equal to X from your graveyard without paying its mana costs.
: The Tarnished, Challenger can be your commander. Choose a Background (You can have a Background as a second commander.)