Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Stampede Driver 
Creature — Human Spellshaper · 1/1 · Uncommon · Nemesis · #122
{1}{G}, {T}, Discard a card: Creatures you control get +1/+1 and gain trample until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.35 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 188 | Uncommon | $0.35 | $0.49 |
| Nemesis | 122 | Uncommon | $0.35 | $2.49Out of stock |
One ruling from Wizards of the Coast
- 16 March 2018Stampede Driver's ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won't get +1/+1 or gain trample.