It should be something like "Complete 20 matches, or Win 5." Basically it should be a definite "Do this, get that" type of reward like the rest of them are. I don't have a problem with "do X for a chance at a reward" if I can do X whenever I want, as much as I want. For example, if I want a piece of raid gear I can go do the raid for a chance at the piece I want. The raid will always be there. This event will not always be there, so the rewards should be set up so that you are guaranteed to get them if you do a specific thing. The rest of them are set up that way. Complete the raid, get an ornament. Do the nightfall, get an emote. The sparrow should be the same.