Cheapest priced copy (Wilds of Eldraine Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Quickling 
Creature — Faerie Rogue · 2/2 · Uncommon · Magic 2015 · #76
Flash (You may cast this spell any time you could cast an instant.)
Flying
When this creature enters, sacrifice it unless you return another creature you control to its owner's hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 76 | Uncommon | $0.39 | $3.49 |
| Wilds of Eldraine Commander | 103 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 18 July 2014If you control no other creatures when the enters-the-battlefield ability resolves, you must sacrifice Quickling.