Talk:Merry XXX-Mas/@comment-77.127.43.48-20181218140303/@comment-37305408-20181218142910

You could save it till you're at the "365 - 25 Rare Card Duplicates" or the "470 - 40 Common Blue card duplicates" quests.

But the Duel Star Chest isn't the best place to complete those tasks, and def won't complete them just by itself. Can't get higher than rares in that chest, anyways. But if you're close to a task requiring common blue or rare blue duplicates, I'd wait and open it then (every bit helps fight the RNG of getting the card rarity+color u need), otherwise just open it whenever and it shouldn't be that big a deal in the grand scheme of things.