Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Murder Investigation 
Enchantment — Aura · Uncommon · Gatecrash · #21
Enchant creature you control
When enchanted creature dies, create X 1/1 white Soldier creature tokens, where X is its power.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 21 | Uncommon | $0.35 | $0.79 |
| Jumpstart 2022 | 219 | Uncommon | $0.35 | — |
| Magic Origins | 27 | Uncommon | $0.35 | $0.99 |
2 rulings from Wizards of the Coast
- 24 January 2013To determine how many Soldier tokens are created, use the power of the enchanted creature as it last existed on the battlefield.
- 24 January 2013If another player gains control of either Murder Investigation or the enchanted creature (but not both), Murder Investigation will be enchanting an illegal permanent. The Aura will be put into its owner’s graveyard as a state-based action.