Cheapest priced copy (Theros Beyond Death Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Treacherous Blessing 
Enchantment · Rare · Theros Beyond Death · #117
When this enchantment enters, draw three cards.
Whenever you cast a spell, you lose 1 life.
When this enchantment becomes the target of a spell or ability, sacrifice it.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros Beyond Death Promos | 117p | Rare | $0.49 | $0.79 |
| Theros Beyond Death Promos | 117s | Rare | — | $1.49 |
| Theros Beyond Death | 117 | Rare | $0.49 | $0.49 |
| Theros Beyond Death | 316 | Rare | $0.59 | $0.99 |
2 rulings from Wizards of the Coast
- 24 January 2020An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
- 24 January 2020If you cast a spell that targets Treacherous Blessing, you choose whether you lose 1 life before or after you sacrifice it. You lose 1 life even if you sacrifice it first.