By paying a massive chunk of your own life into Fire Covenant, you channel that self-inflicted pain directly into Ill-Tempered Loner // Howlpack Avenger. Because Ill-Tempered Loner // Howlpack Avenger's back face (Howlpack Avenger) features a static trigger that fires whenever *any* permanent you control is dealt damage, it turns that colossal hit right back around. The resulting trigger mirrors the damage perfectly, instantly burning down your opponent's life total to close out the game in one fell swoop.