Niv-Mizzet, the Firemind

Text:

Flying
Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to any target.
: Draw a card.

Rulings:

• 3/16/2018 If a spell or ability causes you to draw multiple cards, Niv-Mizzet’s ability triggers that many times.
• 3/16/2018 If dealing 1 damage to a permanent or player causes you to draw a card, perhaps because Niv-Mizzet is enchanted by Curiosity, you’ll continue this loop until the loop is interrupted, perhaps by a player losing the game.