Meh, something happening and me remembering if it happened are two different things. I'm sure it's happened, but when it happened it was far too late in the battle to make a difference, which is my point. Twenty-four mana is too much for the AI to get to and use in time to have an impact on the battle.
To be fair, I did learn how the other side 'felt,' however their arguments were never strong enough to change my mind, and my arguments weren't strong enough to change theirs. Few participants in those conversations came away with a different opinion than what they had when entering.
You know I'll be there, ready to defend whatever the nerf crew decides goes after next. Though I may change my strategy, if I can't get defenses great, I might join the nerf crew in begging for nerfs to OP invade troops