One of the most famous creatures with MTG Shroud in MTG lore is the Elder Dragon Palladia-Mors
Rakdos, the Muscle Another sacrifice deck commander except I like Rakdos, the Muscle
This means that if you cast a spell from the top of that library, you can't look at the next card until you're done paying for that spell
However, lifegain commanders whose only contribution is an ability that triggers from gaining life, for example, are generally excluded to keep the list manageable
The biggest downside to this saga, of course, is that your opponents are given ample time to play around Phyrexian Scriptures' chapter abilities
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a spectacle cost), add any cost increases, then apply any cost reductions