Your search for "dimir doppelganger 12" revealed the following:
Dimir Doppelganger (GK1) from GRN Guild Kit, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Jim Murray Card Text:1UB: Exile target creature card from a graveyard. Dimir Doppelganger becomes a copy of that card, except it has this...
Dimir Doppelganger (CNS) from Conspiracy, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Jim Murray Card Text:1UB: Exile target creature card from a graveyard. Dimir Doppelganger becomes a copy of that card and gains this ability.
Dimir Doppelganger (Foil) (CNS) from Conspiracy, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Jim Murray Card Text:1UB: Exile target creature card from a graveyard. Dimir Doppelganger becomes a copy of that card and gains this ability.
Dimir Doppelganger (RAV) from Ravnica: City of Guilds, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Jim Murray Card Text:1UB: Remove target creature card in a graveyard from the game. Dimir Doppelganger becomes a copy of that card...
Dimir Doppelganger (Foil) (RAV) from Ravnica: City of Guilds, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Jim Murray Card Text:1UB: Remove target creature card in a graveyard from the game. Dimir Doppelganger becomes a copy of that...