Cheapest priced copy (Nemesis): $0.39 at Card Kingdom, near mint, their price list as of .
Downhill Charge 
Instant · Common · Nemesis · #79
You may sacrifice a Mountain rather than pay this spell's mana cost.
Target creature gets +X/+0 until end of turn, where X is the number of Mountains you control.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.39 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Venser vs. Koth | 69 | Common | $0.99 | — |
| Nemesis | 79 | Common | $0.39 | $6.99 |