Reid Duke has toyed with this concept as well, and Chris VanMeter, who was my original inspiration for exploring the shell, played the following version of it in this Versus video
And to think I just gave you that same thrill, free of charge
Its not an approach I often take, but when I do, I only get better and better at the art of not needing subtlety
It also has exalted - which means that if you have a creature attacking on its own, it gets +1/+1 until the end of the turn
There are only a few slots for random off-theme creatures, so use those sparingly
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases (such as that of this Saga's second chapter), then apply any cost reductions