Metamorphic Alteration/Archfiend of the Dross Bug
My opponent used Metamorphic Alteration to copy his Archfiend of the Dross, but on my creature. It copied his Archfiend of the Dross, but without the four oil counters on it, so I immediately lost the game.
It seems like the oil counters should either be copied, or the copied Archfiend of the Dross should "enter the battlefield with four oil counters on it. Otherwise, this ability breaks games.
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[Deleted User] commented
The game handled that correctly. Becoming a copy of something is not the same as entering the battlefield as that something. So the Archfiend's replacement effect that lets it enter with oil counters never gets to apply, and thus the creature that turned into an Archfiend doesn't get those counters. Otoh, it keeps all the counters, auras, and equipment is had before becoming a copy (if they can still be legally attached).