Cheapest priced copy (Midnight Hunt Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Prowling Geistcatcher 
Creature — Human Rogue · 2/4 · Rare · Midnight Hunt Commander · #21
Whenever you sacrifice another creature, exile it. If that creature was a token, put a +1/+1 counter on this creature.
When this creature leaves the battlefield, return each card exiled with it to the battlefield under your control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Midnight Hunt Commander | 21 | Rare | $0.49 | — |
| Midnight Hunt Commander | 59 | Rare | $0.79 | — |
2 rulings from Wizards of the Coast
- 24 September 2021If you sacrifice a nontoken creature you control but don't own, Prowling Geistcatcher will still cause you to exile that card from its owner's graveyard. The card will be returned to the battlefield under your control with the rest of the exiled cards when Prowling Geistcatcher's last ability resolves.
- 24 September 2021If you sacrifice a creature token you control but don't own, you will still put a +1/+1 counter on Prowling Geistcatcher.