holy π₯ dude ur right i got my second phenoix in only 20 packs ,and my second headlong rush in the first 5 pack, this mini box is godly , iv never had such good luck :D
There actually is a trick to it. Idk if it's the same as your's, but mine is using a specific character with a skill and level. I usually get SR and UR as long as I am doing the 10 packs. I've only opened 600 packs and I have a π₯ ton of UR and SR x2 and 3.