alxnjsh: Nice map! I approve. :)
I think that we're closer to adult sexual (since that's half the fun) at least after the battles. In fact, after waking up from a particularly . . invigorating dream on the subject, I had a few ideas about the After Phase.
So you've beaten your opponent, and have them fairly helpless at your feat. Not counting those pervy Planeswalkers out there, why wouldn't you want to just kill them, or even let them go without doing anything? Power, that's why. With their magical power depleted, the only resistance they have left is their mental and emotional fortitude. By having your way with them (Via yourself, your creatures, maybe even gender tweaking magic if that's your thing.) you weaken those final barriers just enough to steal a fragment of their power, which you wouldn't be able to acquire if you killed them.
Assuming we go with the idea that everyone has one Block to start with, the fun-time after the actual battle allows you access to one Set from the enemy's Block after you weaken them enough to steal a bit of their power. I say 'steal', but I don't mean the enemy can't use that Set that you choose (Or maybe randomly gets chosen via a quick diceroll?).
Comments, concerns, etc? I'll see if I can write up a little bullet-point thing on issues to be decided on later, since I might be going to the movies pretty soon.