Dimir Doppelganger is a rare Creature — Shapeshifter card from Ravnica: City of Guilds (RAV), collector number 202. Current market price: $0.70 (foil $4.75), TCGplayer market prices via Scryfall.
{1}{U}{B}: Exile target creature card from a graveyard. This creature becomes a copy of that card, except it has this ability.