Drawing extra cards are when your draw more cards than 1 card during your Draw Phase without a effect that allows that or draw more cards than a card effect says so (Example:Drawing 2 cards when activating Destiny Draw)

Drawing extra cards damages the game state beyond repair, and as such, carries a severe penalty. However if the judge can logically determine which card was drawn (such as when they only have 1 card in their hand), then this may be downgraded to a warning.