Cheapest priced copy (Ikoria: Lair of Behemoths): $7.49 at Card Kingdom, near mint, their price list as of .
Fiend Artisan 
Creature — Nightmare · 1/1 · Mythic · Secret Lair Drop · #1645
This creature gets +1/+1 for each creature card in your graveyard.
{X}{B/G}, {T}, Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $7.49 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 220 | Mythic | $7.49 | $7.99 |
| Ikoria: Lair of Behemoths | 350 | Mythic | $9.99 | $15.99 |
| Ikoria: Lair of Behemoths Promos | 220p | Mythic | $7.99 | $9.99 |
| Ikoria: Lair of Behemoths Promos | 220s | Mythic | — | $12.99 |
| Secret Lair Drop | 1645 | Mythic | $9.49 | — |
| Secret Lair Drop | 1645★ | Mythic | — | $9.49 |
| Special Guests | 83 | Mythic | $8.99 | $11.99 |
3 rulings from Wizards of the Coast
- 17 April 2020Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Fiend Artisan may become lethal if creature cards leave your graveyard during that turn.
- 17 April 2020If a card in a player's library has {X} in its mana cost, X is considered to be 0.
- 17 April 2020Fiend Artisan's first ability applies only while it's on the battlefield.