Cheapest priced copy (Weatherlight): $0.35 at Card Kingdom, near mint, their price list as of .
Betrothed of Fire 
Enchantment — Aura · Common · Weatherlight · #89
Enchant creature
Sacrifice an untapped creature: Enchanted creature gets +2/+0 until end of turn.
Sacrifice enchanted creature: Creatures you control get +2/+0 until end of turn.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Weatherlight | 89 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 1 April 2008If you control Betrothed of Fire, but it’s attached to a creature you don’t control, no one can activate the last ability. The creature’s controller can’t activate it because that player doesn’t control the Aura. You can’t activate it because you can’t pay the cost — you can’t sacrifice a creature you don’t control.