Darth Traya, Lord of Betrayal

Reach, Intimidate (This card can only be blocked
by artifact creatures or creatures that share a
color with it)
Darth Traya can not be the Apprentice and never
has hexproof.
When Darth Traya enters the battlefield, you
may make her the Dark Lord. Take control of a
creature an opponent controls until she leaves the battlefield. If the creature targeted this way is an opponents commander, take damage equal to its
mana value.