I suggested something similar a few weeks ago on the feedback forum, but it would have granted Vanguard marks, and it would have added a new modifier after every 5 waves
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My Destiny circle of about 20. Either love or hate PvP. Some only PvP as part of events but hate doing so. One even quit mainly because you are forced in PvP for underwhelming exotics. This will provide another way to earn marks and mats.