Hazezon was also the first token-maker to make a number of tokens based on a variable (in this case, the number of lands under your control)
Thoughtlace was first released in the set Limited Edition Alpha, illustrated by Mark Poole
Multiple versions of your commander means more value per spell cast, and greater resiliency to spot removal
For instance, there's a popular combo with the MTG commander Magda, Brazen Outlaw where you make Magda an artifact using Liquimetal Torque, then tap her and another artifact to untap herself, making a treasure in the process
And, yes, it's incredibly powerfulbut at Bracket 3 and above, is it really out of the question