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If Otrimi deals combat damage to a player at the same time that it's dealt lethal damage, Otrimi (or any other creature card with mutate that was merged with it) can be the target of its triggered ability

I have seen this played in a wide variety of mid range or control decks in all non-green decks that would never be able to consider including a Metalworker

A proxy on the other hand is plain and obvious about not being a genuine Magic Card

As Magic has started to enter into new intellectual properties, the question of how planeswalkers would function outside of Magic canon, if at all, entered into the discussion