On paper, Wizards is very careful about the sanctity of color identity rules, as the recent Prepared mechanic demonstrates
Controlling a second Knight in ELD Draft isnt difficult
It feels like it's weaker than the imperial command when attacking second, and even if it's knocked down by the first attack, there are many backfires such as super fusion, one drop, and Kozusai
There are many colors for your choice
If you look at artifacts from the early days of Magic (like Alpha/Beta/Unlimited ), on noncreature artifacts, you'll see that there's extra words on the type line: "mono", "poly", and "continuous"
Tier 3 - Not Recommended Skip grading Multipliers look attractive but raw values are too low to justify $20-50 grading costs