>>544903772
How topical, I was just about to complain about how there are not enough of them to do! Because seriously, I am really nervous about being unable to redeem the next keys.
For Raiden, the rotation is ABSOLUTELY key. Watch a youtube video guide, because if you don't have C2 your timing has to be basically perfect.

But yes, some of the trials are complete dogshit. They should let you use your own supports instead of their comically under-built ones.