FOILCheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Circle of Protection: Black 
Enchantment · Uncommon · Ninth Edition · #10★
{1}: The next time a black source of your choice would deal damage to you this turn, prevent that damage.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
26 printings · $0.35 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 10 | Common | $0.99 | — |
| 30th Anniversary Edition | 10 | Common | $0.99 | — |
| 30th Anniversary Edition | 307 | Common | $15.99 | — |
| Revised Edition | 9 | Common | $0.35 | — |
| Fourth Edition Foreign Black Border | 14 | Common | — | — |
| Fourth Edition | 14 | Common | $0.35 | — |
| Fifth Edition | 17 | Common | $0.35 | — |
| Classic Sixth Edition | 8 | Common | $0.35 | — |
| Seventh Edition | 6 | Common | $0.35 | — |
| Seventh Edition | 6★ | Common | — | $4.99 |
| Eighth Edition | 10 | Uncommon | $0.35 | — |
| Eighth Edition | 10★ | Uncommon | — | $0.79 |
| Ninth Edition | 10 | Uncommon | $0.35 | — |
| Ninth Edition | 10★ | Uncommon | — | $2.49 |
| Collectors' Edition | 10 | Common | $2.49Out of stock | — |
| Intl. Collectors' Edition | 10 | Common | $1.29Out of stock | — |
| Foreign Black Border | 9 | Common | — | — |
| Ice Age | 12 | Common | $0.35 | — |
| Introductory Two-Player Set | 2 | Common | — | — |
| Limited Edition Beta | 10 | Common | $8.49 | — |
| Pro Tour Collector Set | shr14sb | Common | $0.35 | — |
| Rivals Quick Start Set | 2 | Common | — | — |
| Summer Magic / Edgar | 9 | Common | — | — |
| Tempest | 8 | Common | $0.35 | — |
| World Championship Decks 2000 | tvdl8sb | Common | $0.35 | — |
| World Championship Decks 1997 | jk17sb | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 4 October 2004A source of damage is a permanent, a spell on the stack (including one that creates a permanent), or any object referred to by an object on the stack. A source doesn’t need to be capable of dealing damage to be a legal choice.
- 4 October 2004Can be used even when there is no damage to prevent. It prevents the next damage (if any) from the source this turn.