Like I mentioned about leaving out Time SieveTime Sieve, I've found it's worth leaving a few wins on the table over dropping Blightsteel ColossusBlightsteel Colossus into play at the end of their turn
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Considering that you don't seem to be on a budget, I'd recommend the following cards: Add ramp cards like Burgeoning, Exploration, Topiary Stomper and Wayward Swordtooth
In most Commander opening hands, the Sprawl is less of a sure thing
Check out more images of this impressive feat here
Assassin Gauntlet is also an artifact, so its nicely tutorable, easy to recur, and blinkable