Yami Marik

Eminence - Whenever a player loses life, while this
card is in the command zone or on the battlefield,
that player sends that many cards from their
library to the graveyard.
When Yami Marik enters the battlefield, two
target players shuffle their graveyard into their
library.
Ace Monster (You can have two commanders if both
have Ace Monster, and one is a Duelist.)