Nicol Bolas, the Second Sun

Flying
When Nicol Bolas, the Second Sun enters the battlefield, choose one—
• Exile target legendary permanent.
• Each opponent discards two cards and you
draw two cards.
• Amass 3. (Put three +1/+1 counters on an Army
you control. If you don't control one, create a 0/0
black Zombie Army creature token first.)