In Commander its an auto-include in colorless or artifact deck, too
Knowing youre the only one that can play combat tricks or removal spells during combat makes it much easier to decide who to attack with what creatures
At five mana youre not going to get this flipped before turn 6 at the earliest, but thats about when youre confidently in second spell category anyways
Fortunately for you and unfortunately for your opponents, because Blightsteel Colossus is indestructible, if they dont have an exile card, a creature 11 power or greater, or a horde of creature tokens with a total power of exactly 11, the game is done
It makes your opponent see something so beautiful they cant attack
Beyond the names and creatures youd expect, this extends to creatures such as Bill the Pony