Cheapest priced copy (Forgotten Realms Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Chain Reaction 
Sorcery · Rare · Worldwake · #74
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
19 printings · $0.49 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 116 | Rare | $0.49 | — |
| Commander 2015 | 144 | Rare | $0.69 | — |
| Commander 2018 | 121 | Rare | $0.79 | — |
| Commander 2021 | 161 | Rare | $0.49 | — |
| Commander Legends: Battle for Baldur's Gate | 783 | Rare | $0.49 | — |
| Commander 2011 | 113 | Rare | $0.99 | — |
| Aetherdrift Commander | 47 | Rare | $0.49 | — |
| Lorwyn Eclipsed Commander | 92 | Rare | $0.49 | — |
| Edge of Eternities Commander | 87 | Rare | $0.59 | — |
| Foundations Commander | 144 | Rare | $0.59 | — |
| New Capenna Commander | 265 | Rare | $0.49 | — |
| Neon Dynasty Commander | 103 | Rare | $0.49 | — |
| Phyrexia: All Will Be One Commander | 97 | Rare | $0.49 | — |
| Starter Commander Decks | 126 | Rare | $0.49 | — |
| Secret Lair Drop | 2219 | Rare | $1.49 | $1.99 |
| Secrets of Strixhaven Commander | 121 | Rare | $0.49 | — |
| Star Trek Commander | 280 | Rare | — | — |
| Star Trek Commander | 450 | Rare | — | — |
| Worldwake | 74 | Rare | $0.79 | $15.99 |
One ruling from Wizards of the Coast
- 1 March 2010The value of X is determined as Chain Reaction resolves.