Lottery
Not sure if this was suggested already but this would be so cool if there was a weekly lottery with a big jackpot. All you have to do is enter a number between 1-1000 (can only enter once) and the number that is exactly (or the closest) to the winning number gets the prize. Prize can be gold or anything else you have in mind.
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Ezreal
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Actually, a lot of people are running contests & sweepstakes on the forums! Check it out :)