This is really very costly, took me 3 extra SP just to clear the path. Spent 391 CP (with 200 from refill) and 5 SP so far for both girls.    I had 35 drops for Yelena. Another 26 drops for Valentina.     I've had 5 Shards for her, had one single shard drop because of not paying attention. --- I started with 260 CP, bought one refill for 2160 kobans, will have to buy a few more tomorrow. At least the droprate seems to be pretty good for two girls. Could spend the rest