Playing a wee little informal test using the trainer, and I'm starting to see where I, the uninformed newbie, am wrong, and you, the established veterans, are correct. While the SoFr certainly doesn't HURT, it doesn't help nearly as much as one would like. The main problem as I see it is the cost. When you have to choose between 1. Diving your 15 damage wyrm for a total of 30, or 2. playing a SoFr for a 25% chance of that wyrm doing 22 damage.......Well, the answers pretty clear there.
TL;DR version, I'm wrong and have learned a lesson, HOORAY FOR LEARNING