Cheapest priced copy (Tenth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Guerrilla Tactics 
Instant · Uncommon · Tenth Edition · #211
Guerrilla Tactics deals 2 damage to any target.
When a spell or ability an opponent controls causes you to discard this card, it deals 4 damage to any target.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
10 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 211 | Uncommon | $0.35 | $0.49 |
| Eighth Edition | 192 | Uncommon | $0.35 | — |
| Eighth Edition | 192★ | Uncommon | — | $0.79 |
| Ninth Edition | 196 | Uncommon | $0.35 | — |
| Ninth Edition | 196★ | Uncommon | — | $0.49 |
| Alliances | 74a | Common | $0.35 | — |
| Alliances | 74b | Common | $0.35 | — |
| Deckmasters | 13a | Common | $0.39 | — |
| Deckmasters | 13b | Common | $0.35 | — |
| The List | 10E-211 | Uncommon | — | $0.35 |
3 rulings from Wizards of the Coast
- 4 October 2004Discarding as a cost to cast a spell will not trigger the ability. Only discarding as an effect will trigger the ability.
- 4 October 2004If it is discarded, the damage done by it is done by this card due to an ability and not by a spell.
- 4 October 2004The second ability will trigger even on an optional discard caused by an opponent.