Cheapest priced copy (Shadowmoor): $0.49 at Card Kingdom, near mint, their price list as of .
Knollspine Invocation 
Enchantment · Rare · Shadowmoor · #99
{X}, Discard a card with mana value X: This enchantment deals X damage to any target.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 99 | Rare | $0.49 | $0.79 |