When the Collection timer expires, you will no longer have access to the collected cards and sets.

Any Badges you earned will stay permanently visible in your Profile.

After finishing the main Collection, the Grand Collection phase starts automatically. It uses the same cards but offers higher rewards.
Stars you earned in the regular Collection carry over to the Grand Collection. However, Stars do not transfer between different Collections.

After completing the Grand Collection, the Winter Collection will unlock. This stage works like the Grand Collection but allows you to keep progressing through additional rounds. Each time you complete the Winter Collection, it starts again, and you can continue finishing it as long as the Collection timer is active.

You can still view completed Collections and Badges in your Profile after the event ends.

If the timer runs out while you are offline, the Collection ends once you come back online, following the usual end-of-event flow.

As you progress through later Collection stages, card packs at some reward drop points may be replaced with other rewards.