Chief Larak of Mor Khazgur

When Chief Larak enters the battlefield, draw X
cards rounded down where X is the greatest
power among Orcs you control.
As long as Chief Larak is on the battlefield or in
your graveyard, other Orcs you control have
"{t}: Challenge" (This creature fights your
commander. If that creature dies this way, return it to
the battlefield tapped and it loses the Chief creature
type. This creature becomes your commander and is a legendary Chief in addition to its other types."