Cheapest priced copy (Adventures in the Forgotten Realms): $0.99 at Card Kingdom, near mint, their price list as of .
Flameskull 
Creature — Skeleton · 3/1 · Mythic · Adventures in the Forgotten Realms · #143
Flying
This creature can't block.
Rejuvenation — When this creature dies, exile it. If you do, exile the top card of your library. Until the end of your next turn, you may play one of those cards. (If you cast Flameskull this way, you can't play the other card, and vice versa.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.99 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 143 | Mythic | $0.99 | $0.99 |
| Adventures in the Forgotten Realms | 378 | Mythic | $0.99 | $0.99 |
| Adventures in the Forgotten Realms Promos | 143a | Mythic | — | $3.99 |
| Adventures in the Forgotten Realms Promos | 143p | Mythic | $0.99 | $0.99 |
| Adventures in the Forgotten Realms Promos | 143s | Mythic | — | $0.99 |
2 rulings from Wizards of the Coast
- 23 July 2021Exiling Flameskull as its triggered ability resolves isn't optional, but if Flameskull leaves the graveyard before the ability starts resolving, you won't exile it or the top card of your library.
- 23 July 2021You must still pay all costs and follow all timing rules for spells cast this way. Likewise, playing lands this way is subject to the normal rules for playing lands.