M'daien, Bane of Heroes

M'daien, Bane of Heroes can only block or be blocked by legendary creatures.
When M'daien, Bane of Heroes enters the battlefield, discard your hand.
Whenever M'daien, Bane of Heroes destroys a legendary creature in combat, you may draw a card.
"Another one bites the dust." -M'daien, Bane of Heroes