Premium crystal
It's messed up how many 3 and 4 star champs go by then when you stop the crystals all the sudden nothing but 2 starts. I'm sick of being screwed first I didn't greet my 4 tier skill catalyst I win it showed but just vanished after and the way the game allows the computer to do things you'll never be able to like attack u in middle of your attack and block as soon as it's attack is done. I spend to much money to be done like this. I'm not going to spend anymore till I see a change