Got mine after 18 wins with boons also you can have 1 or more loses as long as you have 9 wins you can get one after winning a match after 9 ive seen it drop at game 10 with boons that means at 9 boons dont matter but i think you might have a higher chance percentage if you dont use them that is possible. To the a-holes who don't know what they are talkin about you can have boons actually seen it drop more often than not with the boons. You also can get from gold teir package.
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Got mine at 14-1 with boons. I think the requirement is to have been flawless and then keep playing the card. I'm not sure if you can get it by continuing a 9-1 or 9-2 card.