Cheapest priced copy (GRN Guild Kit): $0.69 at Card Kingdom, near mint, their price list as of .
Dimir Doppelganger 
Creature — Shapeshifter · 0/2 · Rare · GRN Guild Kit · #12
{1}{U}{B}: Exile target creature card from a graveyard. This creature becomes a copy of that card, except it has this ability.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.69 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy | 186 | Rare | $0.79 | $2.99 |
| GRN Guild Kit | 12 | Rare | $0.69 | — |
| Ravnica: City of Guilds | 202 | Rare | $1.29 | $5.99 |
2 rulings from Wizards of the Coast
- 1 October 2005This creature becomes an exact copy of a copied card, except that it also has Dimir Doppelganger's activated ability. If it becomes a copy of a different creature card, the new copy will overwrite the old copy.
- 1 October 2005A permanent's ability that refers to cards the creature exiled (such as Sisters of Stone Death's third ability) only affects cards exiled by other abilities intrinsic to that permanent (such as Sisters of Stone Death's second ability). Suppose that (a) Dimir Doppelganger copies Arc-Slogger, (b) its "deal 2 damage" ability is activated, and then (c) it copies Sisters of Stone Death. Creatures exiled by Arc-Slogger's ability can't be returned with Sisters of Stone Death's ability.