The Combinations I've made:
00:32 Wind Extreme Dragon + Forest Extreme Dragon Rider
+ 8 Cash PowerUp = Bull Extreme Dragon
00:43 Stormy Dragon + Sayan Dragon Rider + 20 Cash PowerUp =
Infernal Dragon Rider
02:25 Green Bahamut Dragon + Electric Dynasty Dragon +
15 Cash PowerUp = Golden Extreme Dragon
3:38 Pyros Titan + Vulcano Golem + 2 Cash PowerUp =
04:37 Hades + God Zeus + 15 Cash PowerUp =
(Mistake) Skull Epic Draggy
05:35 Galaxy Dragon + Sky Bahamut Dragon
+ 15 Cash PowerUp = 3-Head Primal Dragon
06:47 Golden Extreme Dragon + Wind Extreme Dragon
+ 20 Cash PowerUp = Forest Extreme Dragon
07:42 3-Head Primal Dragon + 2 Head Frostfire Dragon Rider + Cash PowerUp = ???
The 07:42 Comes in the next Soul Mixer video, because i lost much cash on this one so i need to refill.
These are not the only combination on getting these dragons, it's based on their stats.
Did you ever realize how I got this much cash? Follow this link to know how I got this much!
3. Once a month I buy the Golden Offer in their game. It's an offer where you can get 480 Cash for the same price!
I hope this video helped you out!