Niv-Mizzet, Visionary 
Legendary Creature — Dragon Wizard
Flying You have no maximum hand size. Whenever a source you control deals noncombat damage to an opponent, you draw that many cards.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL