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In Commander its an auto-include in colorless or artifact deck, too

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

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

On the flipside, if your key engine costs a ton of mana, like Kozilek, the Great Distortion, a big beefy ramp card like Thran Dynamo will get Kozilek out much earlier than a Mind Stone