Niv-Mizzet, Mindblazer

Flying
Whenever a spell or an ability makes you discard a card, draw a card.
Discard a card with converted mana cost X: Niv-Mizzet, Mindblazer deals 1 damage to target creature you don't control with converted mana cost less than or equal to X. Activate this ability only anytime you could cast a sorcery.