I never bother with that quest. It is very hard to complete and Ex Wild Cards are, actually, of very little use. I have no idea why thwy've made a daily quest for them so crazy hard. I only od it in the abovementioned conditions, like Gambit (silver/gold cases), R Gacha-limited mini-events (rolling Rgacha and usinc Card Reveals on step-ups, until i complete this "get 3 SR" daily quest, then wait for the next day), saving Event reward SR cards in my Gift Box until i have 3 of them which i can accept at one on the next day, or getting SR cards from Coliseum event Gacha boxes (though Coliseum events were replaced by Shard events lately, and trading Shards for SR Girl Cards in the Trading Center during Shard events doesn't count for this Daily Mission). And most of the people don't even bother getting 1 SR girl from N Gacha for Daily Quests, because (for me, at least) it usually takes around 70-120 N-Gacha tickets to get one, _every bloody day_, so mosty people just consider to save their time/mouse/nerves and skip that, since you get tons of SR Wild Cards from events (especially Elite Guard) anyway.
Stopped playing all Nutaku's games (and, thus, using HBC and other related forums) around 06.2016