Easy Peasy
This doesn't happen often, so in the rare occasions that it does you have no choice but to brag about it :-)
To be honest, I don't remember finishing my daily quest in five battles before. The reward cards are nothing to speak about but I didn't work hard to get them, so no complaining from me:
Have you ever finished the daily in five matches?
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Mmh, no idea to be honest!
Nice run! Now that everyone has been leveling up their cards it has been harder for me to get on winning streaks.