Hi! Thank you so much for asking.

"Lucky Feast" is a feature of the "Shinobi Feast" event which allows players a chance to win the "Lucky Draw" prize featured the respective day. In order to qualify for "Lucky Draw", you need to have used ingots to buy packs and other items in "Lucky Feast" to get "Lucky Credits". Every 12:00 AM Server time, Lucky Credits will be reset and the system will choose its winners from the TOP 50 (based on the player's total amount of Lucky Credits). You can check the "Lucky Players" for that specific date and the TOP 50 has a chance to win. Of course, Lucky Credits amount will influence your rate of winning, but it is not guaranteed.

Hope that helps!