Your search for "Chain Reaction 74" revealed the following:
Chain Reaction (CMD) from Commander 2011, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Trevor Claxton Card Text:Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Chain Reaction (C15) from Commander 2015, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Trevor Claxton Card Text:Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Chain Reaction (Foil) (WWK) from Worldwake, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Trevor Claxton Card Text:Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Chain Reaction - Uncharted (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Fajareka Setiawan Card Text:Secret Lair x UnchartedChain Reaction deals X damage to each creature, where X is the number of creatures...
Chain Reaction (C18) from Commander 2018, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Trevor Claxton Card Text:Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Chain Reaction - Uncharted (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Fajareka Setiawan Card Text:Secret Lair x UnchartedChain Reaction deals X damage to each creature, where X is the number...