Need help finding something for a event in WoW im making for my guild!

Guys I need some help finding a ticket raffler/randomizer online! Something similar to a csgo gambler. The more $$$/tickets you deposit the higher chance to win! So if player 1 places in 50 tickets, player 2 places in 25 tickets, player 3 places in 100 tickets then player 3 has the biggest chance of win etc.
Some thing really similar like cs:go has gambling! PLEASE FIND ME ONE OF THESE! I want to use it in a event in my guild!