Cheapest priced copy (Scourge): $0.39 at Card Kingdom, near mint, their price list as of .
Proteus Machine 
Artifact Creature — Shapeshifter · 2/2 · Uncommon · Scourge · #141
Morph {0} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When this creature is turned face up, it becomes the creature type of your choice. (This effect lasts indefinitely.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.39 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scourge | 141 | Uncommon | $0.39 | $3.49 |