Cheapest priced copy (The Lost Caverns of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Market Gnome 
Artifact Creature — Gnome · 0/3 · Uncommon · The Lost Caverns of Ixalan · #22
When this creature dies, you gain 1 life and draw a card.
When this creature is exiled from the battlefield while you're activating a craft ability, you gain 1 life and draw a card.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan | 22 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 10 November 2023Market Gnome's last ability will go onto the stack above the craft ability that caused it to trigger. This means you'll gain 1 life and draw a card before the transformed card returns to the battlefield.
- 10 November 2023Most of the time, Market Gnome's last ability will trigger because it was exiled as one of the components used in the craft ability. However, in some uncommon cases, the ability will also trigger if Market Gnome is exiled while you're activating mana abilities as part of paying for that craft ability.