Catwoman, Gotham's Thief

Whenever Catwoman deals combat damage to an opponent, look at their hand. You choose a card
from it and exile it. For as long as it remains
exiled, you may look at it, you may cast it, and
you may spend mana as if it were any color to
cast that card.
"You are part of the night, just like me. We're not
afraid of the dark--we come alive in it. We're thrilled
by it." - Catwoman to Batman