Originally Posted by Tenhou

Actually, i have a better way to do this now. I keep going after the VERY SAME people everytime i battle. People seldom change their card lineup so i just keep refreshing until i get the few that i know i can win against :P

While I'm doing the same, I'm currently fighting all Rank 1s, just to complete the gacha boxes as fast as possible.
If I see I'm not reaching Platinum by the last few days, or I complete that, I'll see to beating easy marks for the consecutive prizes