Cheapest priced copy (Kaldheim): $6.99 at Card Kingdom, near mint, their price list as of .
Burning-Rune Demon 
Creature — Demon Berserker · 6/6 · Mythic · Kaldheim · #349
Flying
When this creature enters, you may search your library for exactly two cards not named Burning-Rune Demon that have different names. If you do, reveal those cards. An opponent chooses one of them. Put the chosen card into your hand and the other into your graveyard, then shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $6.99 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaldheim | 81 | Mythic | $6.99 | $7.99 |
| Kaldheim | 349 | Mythic | $8.99 | $12.99 |
| Kaldheim Promos | 81p | Mythic | $8.49 | $15.99 |
| Kaldheim Promos | 81s | Mythic | — | $10.99 |
2 rulings from Wizards of the Coast
- 5 February 2021While in your library, a double-faced card has only the name of its front face. It's not possible to reveal two of the same double-faced card this way.
- 5 February 2021If you choose not to search your library, no cards are revealed or put anywhere else, and you don't shuffle.