Cheapest priced copy (Theros): $0.39 at Card Kingdom, near mint, out of stock, their price list as of .
Boon of Erebos 
Instant · Common · Theros · #80
Target creature gets +2/+0 until end of turn. Regenerate it. You lose 2 life.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.39 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros | 80 | Common | $0.39Out of stock | $0.49 |
One ruling from Wizards of the Coast
- 15 September 2013The loss of life is part of the spell's effect. It's not an additional cost. If Boon of Erebos doesn't resolve, you won't lose life.