Cheapest priced copy (Modern Horizons): $0.35 at Card Kingdom, near mint, their price list as of .
Answered Prayers 
Enchantment · Common · Modern Horizons · #2
Whenever a creature you control enters, you gain 1 life. If this enchantment isn't a creature, it becomes a 3/3 Angel creature with flying in addition to its other types until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 2 | Common | $0.35 | $1.49 |
2 rulings from Wizards of the Coast
- 14 June 2019If Answered Prayers becomes a creature but you haven’t controlled it continuously since your most recent turn began, you won’t be able to attack with it.
- 14 June 2019Once Answered Prayers becomes a creature, you’ll still gain life whenever a creature enters the battlefield under your control.