Cheapest priced copy (Time Spiral Timeshifted): $0.35 at Card Kingdom, near mint, their price list as of .
Fire Whip 
Enchantment — Aura · Common · Weatherlight · #100
Enchant creature you control
Enchanted creature has "{T}: This creature deals 1 damage to any target."
Sacrifice this Aura: It deals 1 damage to any target.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral Timeshifted | 63 | Special | $0.35 | $6.99 |
| Weatherlight | 100 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 4 October 2004Fire Whip is put into the graveyard if you lose control of the creature since the card text says it can only enchant a creature you control.
- 4 October 2004Remember that you tap the creature as part of the cost of activating Fire Whip's granted ability. So, if you have two Fire Whips on a creature activating the first one will tap the creature, so you can't use the second one or any other ability which requires tapping the creature until you find a way to untap it.