Cheapest priced copy (Shadows over Innistrad): $0.39 at Card Kingdom, near mint, their price list as of .
Breakneck Rider // Neck Breaker 
Creature — Human Scout Werewolf // Creature — Werewolf · 3/3 · Uncommon · Shadows over Innistrad · #147
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
Attacking creatures you control get +1/+0 and have trample.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.39 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadows over Innistrad | 147 | Uncommon | $0.39 | $2.49 |
2 rulings from Wizards of the Coast
- 8 April 2016The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn.
- 8 April 2016To trigger the Werewolf's back face's transform ability, a single player must have cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.