Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Rite of the Serpent 
Sorcery · Common · Khans of Tarkir · #86
Destroy target creature. If that creature had a +1/+1 counter on it, create a 1/1 green Snake creature token.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 86 | Common | $0.35 | $0.49 |
| The List | KTK-86 | Common | $0.35 | — |
4 rulings from Wizards of the Coast
- 20 September 2014If the creature is an illegal target as Rite of the Serpent tries to resolve, Rite of the Serpent won’t resolve and none of its effects will occur. You won’t get a Snake token.
- 20 September 2014You get the Snake token no matter who controlled the target creature.
- 20 September 2014If Rite of the Serpent resolves but the creature isn’t destroyed (perhaps because it has indestructible or it regenerated), you’ll get a Snake token if the creature has a +1/+1 counter on it.
- 20 September 2014Rite of the Serpent won’t create more than one Snake token, even if the target creature had more than one +1/+1 counter on it.