Admittedly, this would require almost 400 mana to deck out all your opponents, but still, think of the possibilities
10 Chandra, Fire Of Kaladesh The Emblem Is The Goal Chandra, Fire of Kaladesh is a low mana value commander that is all about low mana value red spells
So far seven of these Super Jumbo Cards have popped up (and Pikachu wasnt one of them): Fire Energy
In this scenario the card has what I have defined as low sentiment and seems like a great investment
For those who aren't interested in milling their opponents, when used to mill yourself, high-toughness creatures in a Phenax deck can easily enable self-mill win conditions like Laboratory Maniac and Thassa's Oracle.
It provides another angle of attack and a strong win condition in an archetype that can often spin its wheels to no effect