Cheapest priced copy (Neon Dynasty Commander): $9.99 at Card Kingdom, near mint, their price list as of .
Imposter Mech 
Artifact — Vehicle · 3/1 · Rare · Neon Dynasty Commander · #13
You may have this Vehicle enter as a copy of a creature an opponent controls, except it's a Vehicle artifact with crew 3 and it loses all other card types.
Crew 3
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Neon Dynasty Commander | 13 | Rare | $9.99 | — |
| Neon Dynasty Commander | 49 | Rare | $9.99 | — |
2 rulings from Wizards of the Coast
- 18 February 2022Imposter Mech does not copy any subtypes related to a card type that it lost. For example, if Imposter Mech enters the battlefield as a copy of a 1/1 Human Soldier token, it is neither a Human nor a Soldier. It won't gain those subtypes if it is later crewed.
- 18 February 2022If Imposter Mech enters the battlefield as a copy of a creature that was also a planeswalker, it loses both the planeswalker and creature card types. Its controller may activate any loyalty abilities it now has as normal, but it notably cannot be attacked and it does not lose loyalty counters when it is dealt damage.