So as I was progressing through the different levels, I tried to pay attention to my prizes that I earned.
I earned multiple Bombie Fusion cards, 4 Bombie Fusion+ cards, Hippie+, 2 Tiger Sharks, Moonless Raul, Moonless Raul+, Full Moon Raul, Crow+ and wait for it.... a MOTHER EFFIN WITCH DOCTOR!?!?!! I got the witch doctor when I beat level 21. I never thought I would get an S card from the event. I nearly crapped myself when it popped up. So I just want to say, don't give up and keep playing.