Yes, quarrel, meaning a crossbow bolt! Because somehow I thought of that before, I dunno, an argument.
There have been cards of projectiles before, and I continued their trend of doing -X/-X effects, and debilitating effects. I thought of the name of the card quickly, then I went to thinking how that could be reflected in the game in addition to the minus counters.
It took an embarassingly long time for me to remember there's a thing referred to as 'bleed effects' in Magic, where a player loses a 1 life to a repeatable effect.