Actually, the assortment goes like this -
1 Wham Shell
1 Prism Break
1 Cynder
1 Whirlwind
1 Stealth Elf
1 Stump Smash
According to another person in Australia.
I found a random Prism Break and Stump Smash earlier at Walmart, and I saw another person buying a Stealth Elf at the register along with others I didn't see....
Now I'm paranoid that I missed Wham Shell.