Creature type themes work best with aggro decks, since aggro decks almost always run lots of creatures
Paying 10 mana to untap all your lands is a pretty dangerous ability to try and use in Standard, but in Commander you've got a lot more life to work with and can potentially leverage this effect in a lifegain deck for tons and tons of ramp
Squall, SeeD Mercenary [Borderless Surge Foil] #547 Magic Final Fantasy Keep track of your collection value over time
When you pair this with mana dorks like Smokebraider or Flamebraider, you arent just getting value, youre generating infinite mana and infinite untaps
We drafted a paper version of this Cube at an R&D party recently, and I snapped up Mishra's Workshop with my first pick and never looked back
Our final Goblin Grenade (by Ron Spencer) is surprisingly badass, having the goblin be decked out in badass spiky black armour, holding a fish-bone spear of sorts, and a massive cylinder on his back with a fuse that he's ready to pull