Cheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Guardian Angel 
Instant · Common · Unlimited Edition · #22
Prevent the next X damage that would be dealt to any target this turn. Until end of turn, you may pay {1} any time you could cast an instant. If you do, prevent the next 1 damage that would be dealt to that permanent or player this turn.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
10 printings · $0.35 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 22 | Common | $1.29 | — |
| 30th Anniversary Edition | 21 | Common | $0.99 | — |
| 30th Anniversary Edition | 318 | Common | $54.99 | — |
| Revised Edition | 21 | Common | $0.35 | — |
| Collectors' Edition | 22 | Common | $0.99 | — |
| Intl. Collectors' Edition | 22 | Common | $2.79 | — |
| Foreign Black Border | 21 | Common | — | — |
| Limited Edition Alpha | 21 | Common | $24.99 | — |
| Limited Edition Beta | 22 | Common | $4.99 | — |
| Summer Magic / Edgar | 21 | Common | — | — |