Doc, The Mastermind.

This spell costs {1} less to cast for each artifact you control.
When Doc enters the battlefield, mill 4.
{t}: Choose target artifact in your graveyard. You may cast that card this turn.
"Now I don't think I need to give you the speech
about what would happen if you say no, how I could
break your legs and kill everyone you love because you already know that, don't you?"