Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Waxing Moon 
Instant · Common · Eldritch Moon · #177
Transform up to one target Werewolf you control. Creatures you control gain trample until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 177 | Common | $0.35 | $0.79 |
One ruling from Wizards of the Coast
- 13 July 2016You may cast Waxing Moon without targeting a Werewolf. If you do choose a target, and that target becomes illegal, Waxing Moon doesn’t resolve, and your creatures won’t gain trample.