101.1 - All Colossus decks must meet a minimum of 75 cards to be considered legal.
102.1 - Each deck must contain a minimum of two colors.
102.2 - Colorless is not considered to be a color.
102.3 - A deck is considered multi-colored when at least two of the included colors meet a minimum of 4 cards for each of those colors.
103.1 - All cards must have a converted mana cost of or over, except for noncreature artifact spells that tap for mana and have no other effects nor abilities. For example, Sol Ring is legal whereas Azorius Cluestone is not due to its second ability, which is not a mana ability.
104.1 - Cards with in the mana cost must be paid with a minimum of mana total. This does not mean that itself has to be mana or greater.
104.2 - Cards with in the mana cost may have a base casting cost of instead of to be played, an example of this would be Quarantine Field. must be equal to itself, and there are two additional white symbols in the spells casting cost, so you must pay at least mana into each instance of .
105.2 - Cards with alternative mana costs that are less than , such as cards with suspend and morph, are legal as long as the original converted mana cost of the card is .