The video explains it all.
Edit: I want to thank all you guys who have commented, seriously you guys are great. I feel like we need to tell bungie what we expect as a fix to this. I've always liked the idea of buying your mercy at the start but I think that you should be able to buy it again for a higher cost as you get wins. example: I have 5 wins and I just lost my mercy to get another one would cost me 8 trial coin etc. Anyway, again, thank you guys I really appreciate it.
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Holy crap. That was hard to even watch.