Chrissy, Sneaky Plotter

When Chrissy, Sneaky Plotter enters the
battlefield, privately choose 3 spells and write
them down.
While Chrissy, Sneaky Plotter remains on the
battlefield: Whenever a spell is cast that matches
one of the spells you chose, you may reveal that
you chose it, if you do, they lose 3 life and you
draw a card.