Thats 105 possible combinations
Following the above way one should board out: But I could see a different approach working, one where you go on the lockdown route with Counterbalance against U/W/R Delver, which is a valid and viable approach
If, for some reason, a Legendary creature is partnered up with a non-Legendary creature, only the Legendary can serve as your Commander
Then each face-down creature you control gains "This permanent costs less to turn face up" and "When this permanent is turned face up, if it's a creature, put a +1/+1 counter on it." (Look at the top two cards of your library
But how did Paul manage to get his hands on such a rare card
Its an strong option for Commander decks that run mostly legendary creatures, like Esika, God of the Tree, and Jodah, the Unifier