How I got transformer skin with lots of other skins only recharging 250 diamond

Only spent 10$ (5$ first event +5$ 2nd event). With free token got Transformer skin : Grimlock, Bumblebee, Epic skin : Nana, Johnson, Kimmy and other specials and normal skin. I think I was luck to get Bumblebee on Bingo.
N.B : Please don't spend money if you are not professional gamer or if you don't have sufficient income.