Cheapest priced copy (Murders at Karlov Manor): $2.29 at Card Kingdom, near mint, their price list as of .
Doppelgang 
Sorcery · Rare · Murders at Karlov Manor · #414
For each of X target permanents, create X tokens that are copies of that permanent.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $2.29 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 198 | Rare | $2.29 | $2.49 |
| Murders at Karlov Manor | 414 | Rare | $2.99 | $4.49 |
| Murders at Karlov Manor Promos | 198p | Rare | $8.99 | $14.99 |
| Murders at Karlov Manor Promos | 198s | Rare | — | $5.99 |
4 rulings from Wizards of the Coast
- 2 February 2024If the copied permanent has {X} in its mana cost, X is 0.
- 2 February 2024If the copied permanent is copying something else, then the tokens enter the battlefield as whatever that permanent copied.
- 2 February 2024Any enters-the-battlefield abilities of the copied permanent will trigger when the tokens enter the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the permanent will also work.
- 2 February 2024The tokens copy exactly what was printed on the original permanent and nothing else (unless that permanent is itself copying something else; see below). They don't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.