Primus is a great value card but value is not the thing when you pass the six mana point
Doctor Octopus, Master Planner I think we could have handled a mana value of 8 with a way to reduce the cost on Doctor Octopus, Master Planner, and I like the cute maximum hand size increase
That said, this win condition can be weak in a meta filled with blue decks that can sideboard in Negate and other forms of countermagic
Ob Nixilis, the Hate-Twisted fits this list better but should be treated more like a 5-mana removal spell with upside, or a more costly Underworld Dreams that is a different type of permanent
In an eight-player booster draft, you have seven potential opponents and should be thinking about how your deck will stack up relative to theirs
Even if Chaos Orb werent banned attempting this in a tournament would result in immediate disqualification