EDIT: the BF summon list includes every heroes in the game except S1, costumes and heroes from the Mystery family (Myztero and Enigmo), and obviously 1 and 2* and trainer heroes. But it’s also refreshed only once a year (or twice if you count in the Summer Solstice which is exactly the same as BF, just with a different theme but the game logic is 100% identical).
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