Cheapest priced copy (Battlebond): $0.35 at Card Kingdom, near mint, their price list as of .
Assassin's Strike 
Sorcery · Uncommon · Jumpstart · #200
Destroy target creature. Its controller discards a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 138 | Uncommon | $0.35 | $0.49 |
| Jumpstart | 200 | Uncommon | $0.35 | — |
| Return to Ravnica | 57 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2012You must be able to target a creature to cast Assassin’s Strike.
- 1 October 2012If the creature is an illegal target when Assassin’s Strike tries to resolve, it won’t resolve and none of its effects will happen. Its controller won’t discard a card.
- 1 July 2013If Assassin’s Strike resolves but the creature isn’t destroyed (perhaps because it regenerated or has indestructible), its controller will discard a card.