Cheapest priced copy (Assassin's Creed): $0.35 at Card Kingdom, near mint, their price list as of .
Chain Assassination 
Instant · Uncommon · Assassin's Creed · #23
Freerunning {1}{B} (You may cast this spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or commander.)
Destroy target creature. If another creature died this turn, draw a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Assassin's Creed | 23 | Uncommon | $0.35 | $0.49 |
| Assassin's Creed | 199 | Uncommon | — | — |
3 rulings from Wizards of the Coast
- 5 July 2024Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn. It doesn’t matter what happens to that Assassin or commander after that.
- 5 July 2024If the target creature is a legal target but isn’t destroyed, most likely because it has indestructible, you’ll still draw a card if another creature died this turn.
- 5 July 2024If the target creature is an illegal target by the time Chain Assassination tries to resolve, it won’t resolve and none of its effects will happen. You won’t draw a card even if another creature has died this turn.