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What you get each day is completely random. One time I got 3 double crystal cards in a row - Another time I got 4 days where I kept getting crystals for my daily gift. Most of the time they give you some supplies. The amount of supplies/crystals you get depends on how high your rank is. (The higher it is, the more you get) And if you are Grefieter or below you get an EXP Multiplier every day until you rank past Grefieter.