Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Undercity's Embrace 
Instant · Common · Ravnica Allegiance · #89
Target opponent sacrifices a creature of their choice. If you control a creature with power 4 or greater, you gain 4 life.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | RNA-89 | Common | $0.35 | — |
| Ravnica Allegiance | 89 | Common | $0.35 | $0.49 |
| Ravnica Remastered | 96 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 25 January 2019Whether you control a creature with power 4 or greater is checked only after your opponent has sacrificed a creature. If a creature you own with power 4 or greater was exiled until the sacrificed creature left the battlefield, that creature will return to the battlefield before the check, so it will count. However, any abilities that trigger on the sacrificed creature’s death won’t have resolved yet when you check what creatures you control.
- 25 January 2019You gain only 4 life, even if you control more than one creature with power 4 or greater.
- 25 January 2019You can still gain 4 life even if the target opponent can’t sacrifice a creature.