It is an already confirmed and never fixed bug, that most likely requres the recoding of that card.
Anyway,
Martyrs of Korlis does nothing: it does not prevent any damage from artifacts and is like a vanilla 1/6 creature.
Another bug that I remember is that, when the card was working, it was not possible to use the obvious combo with
Artifact Ward: in fact, the text suggests that the card works without the need of being activated and the player may choose how to distribute damage if 2 of them are in play. So, with
Artifact Ward, all damage should be automatically reduced to zero. Instead, I remember that it was no longer possible to select the enchanted Martyrs to redirect any damage dealt from artifacts, as if it was "redirect on target martyrs of korlis all damage dealt to you by artifacts".