Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Caustic Tar 
Enchantment — Aura · Uncommon · The List · #A25-81
Enchant land
Enchanted land has "{T}: Target player loses 3 life."
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 81 | Uncommon | $0.35 | $0.49 |
| Magic 2015 | 89 | Uncommon | $0.35 | $0.49 |
| Odyssey | 122 | Uncommon | $0.35 | $1.99 |
| The List | A25-81 | Uncommon | $0.35 | — |