Cheapest priced copy (Fourth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Venom 
Enchantment — Aura · Common · Fourth Edition Foreign Black Border · #280
Enchant creature
Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
5 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fourth Edition Foreign Black Border | 280 | Common | — | — |
| Fourth Edition | 280 | Common | $0.35 | — |
| Fifth Edition | 336 | Common | $0.35 | — |
| The Dark | 90 | Common | $0.35 | — |
| Renaissance | 165 | Common | — | — |
One ruling from Wizards of the Coast
- 4 October 2004If this Aura is moved onto a creature after blockers are declared, creatures blocking the newly-enchanted creature are not affected. This is because the ability triggers at the time blocking occurs.