Don't forget the P2W N card only available at Event Gacha (and removed at 2nd phase too): Shuri Tsutsui.
Even now many people doesn't believe that Nutaku did it, SELLING A FUCKING N CARD! A
And they did it again at 4th EG, putting Wako there before some complains came public. She was N slayer from 3rd elite guard, put back in combat after complains.
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But well, they always can do it worse.