Hi guys, just started past friday and I've been playing like a possesed!

Got a few questions, maybe you can help me please:

I'm at League 18 right now, and there's still a LOT of card that I can't evolve into the next rarity (rare to epic or legendary) because it
sais the card hasn't been discovered, my question is, the only way to discover those cards is by buying boosters?

Second question, I recieved like 600 purple small bottles or such from an event, no idea whre/how to use them....

Last one, I saw many new creatures lately, no bitches LOL, but skeletons, minotaurs, cyclops... very cool stuff, where can you get that kind
of stuff, because I've never got even one of them on the many booster I've open.

Thank you!
And just in case you are new, here's my referal, follow it and we both will win

VWBGDJ