Lazav, Dealer in Whispers

Flash, hexproof from 3 colors
When Lazav, Dealer in Whispers enters the battlefield, exile target spell or permanent that's 1, 2, or 3 colors for each opponent a different player controls.
Players who don't own the exiled spell may cast that spell, paying blue and black mana as though it was mana of any color. When a player other than you casts a spell this way, they lose 3 life, you gain 3 life and draw a card.