This guide will let you know how to get a Cobra Rage bundle in 500 diamonds.
You will need to use spin several times to get the Cobra Range bundle. Use 1 spin first, and you will get this reward.
The next spin will again reward you with a new item.
You can also use 90 diamond spin and try to get the cobra rage bundle.
Go to your backpack and claim the rewards.
If you fall short of diamonds, exit the game and come back the next day, as you will get diamonds every day. And spin again to get the bundle.
Use 90 diamond spin a few times, and you will surely get the cobra rage bundle within 500 diamonds.