I would say that Baze isn't worth putting everything into since the rebel meta is gone and doesn't look to be on the rise. But if he's the one character you really want, spend your crystals solely on buying his shards when in the store or on refreshes of his node and on energy. I would think that the refreshes would be cheaper. 50 for refreshing the node and 50 for 120 energy. With decent rng you should get more than 3 shards. But after a few tries when the cost goes up for refreshing, the 3 for 150 crystals would be better.