This card was printed in the following sets:

Card Name: Symbol Set Block
Chameleon Colossus Morningtide (Rare) Morningtide Lorwyn Block
Chameleon Colossus Archenemy (Rare) Archenemy Miscellaneous
Chameleon Colossus From the Vault: Twenty (Mythic Rare) From the Vault: Twenty Miscellaneous
Chameleon Colossus Commander 2015 (Rare) Commander 2015 General
Chameleon Colossus Adventures in the Forgotten Realms Commander (Rare) Adventures in the Forgotten Realms Commander

This card has restrictions in the following formats:

Format Legality
Modern Legal
Legacy Legal
Vintage Legal
Commander Legal
x For more information regarding each format and play style modifications, visit the Banned / Restricted Lists for DCI-Sanctioned Tournaments page on the Magic: The Gathering website.

Gatherer works better in the Companion app!