mtg commander deck phyrexia Atraxa, Grand Unifier PHYREXIAN INFECT PROLIFERATE Magic Custom Co – CommanderComplete card ready Mtg Phyrexia All Will Be

The most popular archetype in Columbus was "some sort of The Rock" with the top-finishing deck two-for-one Red Rock in the Top 16

Firstly, it's creatures lose all abilities clause nerfs indestructible-based protection, which is common in Commander

Banned in Standard, and still sees heavy play in formats like Pioneer, Modern, Commander, and Cubes

People like to buy boxes to crack lots of packs, have higher chances of finding that special rare or mythic they need, or play Limited

Quick answer: both

Caetus, Sea Tyrant of Segovia Color Indicator: Blue Legendary Creature Serpent Noncreature spells you cast have convoke