Agent of the Shadow Thieves

Backgrounds bolted a keyword-style clause onto whichever commander you paired them with, and this one hangs its whole payoff on a single inverted piece of table math. The clause it hands your commander creatures triggers only when you swing at the seat that no opponent is above in life: the healthiest player, or one tied for the lead. That gate runs against the natural multiplayer reflex to pile onto whoever is already crippled. Here the incentive flips, steering aggression at the archon rather than the wounded, and the reward compounds as the game does: a counter that sticks, plus deathtouch and indestructible through the turn. Those two keywords stacked make the attacker a blocker-proof battering ram that also survives whatever it trades with, so the leading player is punished for the crime of being ahead while your creature walks away larger for the next swing. The static ability grants the trigger rather than aiming it, so any commander creature you own carries the clause automatically, which is what makes it hum in partner and Background pairings where more than one general can be attacking at once. It is a quietly political design: a pressure valve pointed at the runaway life-gain seat that a durdling multiplayer table so often produces, built to make being in front dangerous instead of comfortable.