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Sorcery
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
"We train for the improbable, like lightning striking the same place twice, or striking everywhere at once." —Nundari, Sea Gate militia captain

Lorwyn Eclipsed Commander
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Secret Lair Drop
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Edge of Eternities Commander
#87 · rare

Aetherdrift Commander
#47 · rare

Phyrexia: All Will Be One Commander
#97 · rare

Commander Legends: Battle for Baldur's Gate
#783 · rare

New Capenna Commander
#265 · rare

Neon Dynasty Commander
#103 · rare

Forgotten Realms Commander
#116 · rare

Commander 2021
#161 · rare

Commander 2018
#121 · rare

Commander 2015
#144 · rare

Commander 2011
#113 · rare

Worldwake
#74 · rare
The value of X is determined as Chain Reaction resolves.
wotc · 2010-03-01