Chameleon, Master of Disguise {3}{U}
Legendary Creature — Human Shapeshifter Villain
BlueCommander: legal
Identity
Blue
EDHREC rank
#1,726
Cheapest printing
US$0.36
TCGplayer
Printings
3
You may have Chameleon enter as a copy of a creature you control, except his name is Chameleon, Master of Disguise.
Mayhem {2}{U} (You may cast this card from your graveyard for {2}{U} if you discarded it this turn. Timing rules still apply.)
Keywords: mayhem
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.