Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Reckless Bushwhacker 
Creature — Goblin Warrior Ally · 2/1 · Uncommon · The List · #OGW-116
Surge {1}{R} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)
Haste
When this creature enters, if its surge cost was paid, other creatures you control get +1/+0 and gain haste until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 116 | Uncommon | $0.35 | $1.99 |
| The List | OGW-116 | Uncommon | $0.35 | — |
4 rulings from Wizards of the Coast
- 22 January 2016The other spell that you or a teammate cast can be one that's resolved, one that was countered, or (for instants with surge) one that's still on the stack.
- 22 January 2016If an instant or sorcery spell cast for its surge cost is copied, the copy is also considered to have had its surge cost paid.
- 22 January 2016For some cards, surge represents only an alternative cost, a discount that applies if you or a teammate has cast another spell this turn. Other cards, like Reckless Bushwhacker, have additional abilities or effects if you paid the surge cost to cast the spell.
- 22 January 2016Casting a spell for its surge cost doesn't change its mana cost or its mana value.