I am desperate... do you know the odds to get a Level 100 Bloom Dragon here?

Seriously, already last week I had to run this freaking stage too many times for almost nothing, impossibility to Evolve Bipina cosmosmos for 1 whole week, and today again, 9 tries (= 720 Sta!) for ZERO Level 100 Bloom Dragon... ... and 1 try in the 50 Sta stage and I get one...

(
While I really love FKG Gameplay, especially the Team management I would have loved in Kanpani Girls outside Battlefield, I think the only "difficulty" in that game is just the RNG who might troll you again and again (Bloom Dragon and Arrow Spot who randomly choose the direction for you...). IMO that's a huge potential wasted by pure RNG...
)