Whenever you draw a card, you may have target player mill a card.
If a spell or ability causes you to draw multiple cards, Jace’s Erasure’s ability triggers that many times. (The spell or ability finishes resolving before you put Jace’s Erasure’s abilities on the stack.)
If a spell or ability causes you to put cards in your hand without specifically using the word “draw,” Jace’s Erasure’s ability won’t trigger.
