Authors note: Commander should be about fun, rather than about whether you have expensive cards
Early on, ramping them slightly is going to matter more than in the late game, but even if you see Path to Exile early, you'll still happily fire one off
Few black spells in MTG reward disciplined deck construction this aggressively
Sure, Wizards of the Coast is selling even more Commander products every year, but if that leads to better situations for both Commander players and those who dont want to play the format, then its got to be a good thing
But honestly, the last 4 mana Jace we had required a -2 to draw cards, and most Planeswalkers that + to draw cards cost five or more mana
Like with all things, though, whether or not you can use a card is up to you and your opponent