In order to figure out the CMC of the Colossus, you would take 2 red and add it to the 6 generic for a total of 8

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Finally, Sarkhan, Soul Aflame perished too
Even if it doesnt directly defeat the Pokmon, it will be weakened, giving you an advantage in the ongoing battle
This is among the best cards to flicker in a Pauper or Peasant Cube and pulls weight in the right Commander pod as well, especially if you want to teach your opponents that Karoo lands do have a downside