All the referral codes give the same rewards.
The player who gave the code gets 100k and a rare man card(princess)
The player using the code gets 100k and a rare god card(angelic knight)
It is a great help to anyone starting the game. My code is in a post below, if anyone would like to use it I would be very grateful.
I'd greatly appreciate anyone using my code: ebv52028
This would help us both as we both get money and rare cards, thanks