This is because of a few reasons: Cori-Steel Cutter costs 2 mana total as opposed to Cosmogrand Zenith's 3, meaning it can be cast earlier, and it's easier to cast another spell after it to immediately proc its effect
Many decks lean heavily on non-creature permanents that enable their strategy, and losing those can be just as devastating
Choco, Seeker of Paradise All Final Fantasy lovers knew Chocobos would feature strongly in FIN , but no one could've guessed the set would bring us such an incredible bird commander: Choco, Seeker of Paradise
Warleader's Call, Stalwart Shield-Bearers, and Spidersilk Armor are great options for increasing your creatures toughness
In fact, I would be hard pressed to find a sanctioned Type 1 tournament (A.K.A
Boros will always have a special place in my heart