Cheapest priced copy (Innistrad: Double Feature): $0.49 at Card Kingdom, near mint, their price list as of .
Geistflame Reservoir 
Artifact · Rare · Innistrad: Midnight Hunt Promos · #142p
Whenever you cast an instant or sorcery spell, put a charge counter on this artifact.
{1}{R}, {T}, Remove any number of charge counters from this artifact: It deals that much damage to any target.
{1}{R}, {T}: Exile the top card of your library. You may play that card this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 142 | Rare | $0.49 | $0.49 |
| Innistrad: Midnight Hunt | 142 | Rare | $0.49 | $0.49 |
| Innistrad: Midnight Hunt | 355 | Rare | $0.49 | $0.49 |
| Innistrad: Midnight Hunt Promos | 142p | Rare | $0.49 | $0.49 |
| Innistrad: Midnight Hunt Promos | 142s | Rare | — | $0.49 |
2 rulings from Wizards of the Coast
- 24 September 2021You must still pay all costs and follow all timing rules to play a card exiled with Geistflame Reservoir's last ability.
- 24 September 2021You choose how many counters to remove from Geistflame Reservoir as you activate its second ability, not as it resolves.