Cheapest priced copy (Invasion): $0.39 at Card Kingdom, near mint, their price list as of .
Essence Leak 
Enchantment — Aura · Uncommon · Invasion · #55
Enchant permanent
As long as enchanted permanent is red or green, it has "At the beginning of your upkeep, sacrifice this permanent unless you pay its mana cost."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.39 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Invasion | 55 | Uncommon | $0.39 | $0.99 |
One ruling from Wizards of the Coast
- 4 October 2004It can enchant a permanent that is not red or green, but it doesn’t do anything in that case.