Up: The flavortext makes the shift here, but even then it's still hard to grok. I wonder about balance. You're giving your opponent(s) something good in exchange for an undercosted creature, but you're also hurting them if they refuse, which seems weird. I'm not really sure how to rate this, but I'll give it a 6/10.
Boros Ascendancy Enchantment : Create a 1/1 red and white Soldier creature token Whenever two or more creatures you control attack, put a glory counter on Boros Ascendancy for each attacking creature beyond the first. At the beginning of your upkeep, if Boros Ascendancy has twenty or more glory counters on it, you win the game.