Cheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Power Leak 
Enchantment — Aura · Common · Unlimited Edition · #72
Enchant enchantment
At the beginning of the upkeep of enchanted enchantment's controller, that player may pay any amount of mana. This Aura deals 2 damage to that player. Prevent X of that damage, where X is the amount of mana that player paid this way.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
12 printings · $0.35 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 72 | Common | $0.99 | — |
| 30th Anniversary Edition | 71 | Common | $0.99 | — |
| 30th Anniversary Edition | 368 | Common | $19.99 | — |
| Revised Edition | 73 | Common | $0.35 | — |
| Fourth Edition Foreign Black Border | 92 | Common | — | — |
| Fourth Edition | 92 | Common | $0.35 | — |
| Collectors' Edition | 72 | Common | $1.49 | — |
| Intl. Collectors' Edition | 72 | Common | $1.29 | — |
| Foreign Black Border | 73 | Common | — | — |
| Limited Edition Alpha | 71 | Common | $29.99 | — |
| Limited Edition Beta | 72 | Common | $4.99 | — |
| Summer Magic / Edgar | 73 | Common | — | — |