Cheapest priced copy (Jumpstart 2022): $0.99 at Card Kingdom, near mint, their price list as of .
Shadowborn Demon 
Creature — Demon · 5/6 · Mythic · Jumpstart 2022 · #464
Flying
When this creature enters, destroy target non-Demon creature.
At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 464 | Mythic | $0.99 | — |
| Magic 2014 | 115 | Mythic | $0.99 | $5.99 |
2 rulings from Wizards of the Coast
- 1 July 2013Shadowborn Demon’s enters-the-battlefield ability is mandatory. If you control the only non-Demon creature, you must choose it as the target.
- 1 July 2013The last ability checks whether you have fewer than six creature cards in your graveyard when it would trigger. If you have six or more, it won’t trigger at all. The ability will check again when it tries to resolve. If at that time you have six or more, the ability won’t do anything.