Cheapest priced copy (Gatecrash): $0.35 at Card Kingdom, near mint, their price list as of .
Crackling Perimeter 
Enchantment · Uncommon · Gatecrash · #88
Tap an untapped Gate you control: This enchantment deals 1 damage to each opponent.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Gatecrash | 88 | Uncommon | $0.35 | $0.79 |
One ruling from Wizards of the Coast
- 24 January 2013You can't tap an untapped Gate you control for mana and tap it to activate Crackling Perimeter's ability at the same time. You must choose one or the other.