Most of the best colorless cards cost a lot of mana to play, and Zhulodok gives them all double cascade, meaning they'll bring along two other spells for free, giving you three spells for the price of one
The normal 7-mana cost isnt impossible to get to in a control deck like this, but you should gain a massive advantage if you get the miracle cast
These are typically found on the Secret Lair site, and have not been the best bang for your buck financially until now
Silverquill Statement(Black/White): Stylish wordsmiths who master the magic of words, from inspiring battle poetry to biting arcane insults
The goal is fairly straightforward (play enchantments), and the deck should play well out of the box regardless of which commander you put in the command zone
Katerina of Myra's Marvels Katerina of Myra's Marvels falls into a similar category as its marvelous co-workers, but its effect is a little less specific and has a better payoff