2018-2021 Update: 4350+ Gems, 735,000 Alch used. The rates are trash dont get me wrong, the game is not f2p friendly at all. BUT the game is still fun regardless, of course im giving it the benefit of doubt. Collab events are just heavy p2w, especially since the banners will always have the collab units at higher rates WITH 6 random other units with even higher rates. So the only easy way of getting a collab unit is Alch Summon (still bad though), which is still pretty low rates.