Niv-Mizzet, the Omniscient

Flying, Mizziumatrix
Opponent play with their hand and the top card of their library revealed. You may cast copies of cards in your opponent's hand, and spend mana of any kind to cast it.
Whenever you draw a card, or an artifact enters the battlefield under your control, Niv-Mizzet deals 1
damage to any target.
Whenever you copy a card, create a 1/1 colorless
Thopter artifact creature token with flying, then draw
a card.