That said, there is a much better zero mana equip cost artifact in Legacy that sees monstrous amounts of Commander play
Splinter, Aging Champion If Splinter, Aging Champion were a different color it would not make this list, but white is excellent for flicker which means this approaches Thragtusk-level in use and is a great reason to make an EDH politic deal
This card sounds like a great way for red to punish players who lean too far into artifacts while allowing you to create some Treasures at the same time
Unfortunately, since the card's included in the Commander banlist, and isn't you're unlikely to experience the joy of trading a treasure for a Blightsteel Colossus - though you're allowed to run a single copy in Vintage, if you've got the cash
A Druid holding this sword can generate infinite mana, never dying to its own -1/-1 counters