All your enchantments and artifacts help pump up the enchanted creature, and a card like Mycosynth Lattice greatly improves this buff
Suddenly, equipment, auras, and even tiny pingers are deadly weapons
It cant be blocked that combat
A mill strategy can be ambitious in commander with 100 card decks, but Phenax in combination with walls and other high-toughness creatures can mill out your opponent insanely fast
People saw the "Son of Yawgmoth" and assumed a lot of things about this character, including thinking that he was a new character, but K'rrik is in fact an existing character within the lore
If you play this on turn two, it is pretty much guaranteed to be the largest thing on the board, but because Limited is such a creature heavy format, it is also pretty likely that he will be completely outclassed by turn four or so