Time: Dec 3rd, 00:00:00 to Dec 9th 23:59:59 (Sever Time)
During the event, Ghost·Falcon & Ghost·Dagger & Nightmare Hunter·Frost are available in the CRYSTAL PACK, and with a chance to loot.
Meanwhile, during the event, after you purchase 25 CRYSTAL PACK in the store, you’ll receive the guaranteed Ghost·Falcon & Nightmare Hunter·Frost in your deck.
I become not the card gosht flacon by 25 Crystal packs fix that
I did not get Ghost Falcon either after 25 packs but i do now have Ghost Dagger & Nightmare Hunter Frost, so it might be worth checking if you have Ghost Dagger instead.