If the copied creature has {X} in its mana cost, X is 0.
Curie, Emergent Intelligence
Curie's last ability refers to the exiled creature, not the exiled card. In most cases, this means Curie copies exactly what was printed on the original creature and nothing else, plus the additional ability. However, if the exiled creature was copying something else when it was last on the battlefield, Curie copies whatever that creature was copying, plus the additional ability.
If a creature has a characteristic-defining ability that sets its power, indicated with a * or similar in the power and toughness box, that ability is taken into account when determining its base power.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Daniel Romanovsky
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
