ChamCo is back up to 9 dollars from 7.50. This is directly correlated to the rise in BG Elves' popularity recently. Remember who told you to buy them while they were cheap? The card's price is completely dictated by the popularity of BG Elves right now, so keep an eye on the deck's success and volume to understand the direction of Chameleon Colossus. Here's a sample decklist for BG Elves, from the Top 8 of the SCG Atlanta 5k:

1 Loxodon Warhammer
3 Chameleon Colossus
3 Civic Wayfinder
2 Cloudthresher
4 Imperious Perfect
4 Llanowar Elves
4 Putrid Leech
4 Wren's Run Vanquisher
2 Terror
4 Maelstrom Pulse
4 Thoughtseize
1 Nameless Inversion

3 Forest
3 Swamp
4 Gilt-leaf Palace
4 Llanowar Wastes
4 Mutavault
4 Treetop Village
2 Twilight Mire

Sideboard:
2 Pithing Needle
1 Cloudthresher
3 Kitchen Finks
2 Puppeteer Clique
1 Shriekmaw
2 Guttural Response
2 Deathmark
2 Primal Command