These were never intended to leave the building, but a few made it out alive
Likewise, Phage the Untouchable has an ability that makes any player who is dealt damage by this card lose the game outright
Since Archfiend only gets only counters when it enters the battlefield, the end result if that the opponent will have an Archfiend of the Dross with no oil, so you simply pass the turn and make your opponent die to Archfiend of the Dross's ability when they can't remove a counter on their upkeep
Secondly and more importantly, youre faced with a tough choice
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If another effect modifies how much damage a source would deal to an opponent or a permanent they control, including preventing some of it, the player being dealt damage or the controller of the permanent being dealt damage chooses an order in which to apply those effects