I have a plan to build a deck that can get Progenitus on to the battlefield on turn 3 (it's an ongoing joke between my friends and I on who could get Progenitus out quickest with the cards we currently have), but I'm unsure about whether or not I would be allowed Progenitus in my deck at all.
My plan is based on a red/green deck, but obviously Progenitus needs all 5 colours to cast. Within the rules, can I include him anyway? I assume I can, as there are ways of getting him out without casting him, and including cards you don't have the colours for seems more like a stupid move rather than a rule breaking one, but I'm unable to find anything specific about whether or not you have the right colours to include a card in your deck or not.
Thanks in advance for any help and feedback.