A FREE collect-and-combine (card gacha) event. You obtain composite items (cards) from resource tiles and monsters -- both normal bot actions, so time gathering and monster-hunting to the window. There are 5 card colors (Green, Blue, Purple, Orange, Red). Combining 3 cards makes a Lucky Box; there are 10 Lucky Box tiers, higher = more luxurious (contents vary per event, shown only in screenshots). F2P-viable -- cards come purely from gathering/hunting; reward quality depends on which box tier you compose. Because leftover cards are wasted, the page gives an algorithm: (1) select the three most-numerous colors, (2) composite about half the maximum possible, (3) repeat -- remainders occur if the total is not a multiple of 3. A simulation tool computes the combinations consuming the most cards. Commenters note occasional glitches (only one box of each number, or slider resets) fixed by rebooting. No scoring/ranking mechanic -- value is simply the boxes assembled from freely gathered cards. For a bot: the loop is gather + hunt during the event -> accumulate cards -> combine into the highest boxes possible before the event ends; gathering speedups are also a listed reward source elsewhere.
Original research source: Evony Guide Wiki