Altered Ego becomes an exact copy of the printed card you choose with the addition of the +1/+1 counters.
This includes amoungst other things the name, mana cost, types and subtypes. So yes if you copy a servo token or Metallic mimic it will be an artifact creature.
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Every normal man must be tempted, at times, to spit on his hands, hoist the black flag and start slitting throats.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
Note that Servo is a creature type, not an artifact type (C.R. 205.3g, 205.3m); in general, Altered Ego will become an artifact as it becomes a copy of a Servo token only if the token was created as an "artifact creature token" (C.R. 706.2, 111.3).
EDIT (Nov. 11, 2021): One rule was renumbered in the meantime.
This includes amoungst other things the name, mana cost, types and subtypes. So yes if you copy a servo token or Metallic mimic it will be an artifact creature.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
The Crafters' Rules Guru
EDIT (Nov. 11, 2021): One rule was renumbered in the meantime.