Sure, those tokens have Toxic 1, which means they can represent more of a threat than your typical 1/1, I think I would pretty gladly trade Toxic 1 for the ability to block, especially on a card like this
He's a decent beat stick, but what's relevant here is that he can Start Your Engines (introducing the Speed counter from Aetherdrift), and he reduces the cost of non-creature spells you cast by x, where x is your Speed
This outline is just a recommendation for how to build your deck
Now that there are two Marks writing for the site, I don't know which one to tell you to email
This black planeswalkers almost a sacrifice payoff more so than a sacrifice outlet, but it should be on any aristocrat players radar
You don't have to choose a target artifact or enchantment for the last ability