So while this is cool it looks like it is beaten out again by too many similar alternatives
If you want your commander to reward you, I would suggest Ketramose, the New Dawn, which becomes a disgusting card draw engine thats hard to remove and eventually becomes a clock
If you do, they create a tapped 1/1 blue Fish creature token before its other effects.) Choose target creature you control and target creature you dont control
Despite only going in a few possible archetypes it is very powerful in them being a zero mana hard counterspell with no target restrictions, an acceptable normal cost and no associated card disadvantage for the pitch cost
It also sucks that the best background, Inspiring Leader, means youll be in mono white as opposed to green and white
Karn Rarity: Rare TYPE: Vanguard SUBTYPE: - CMC: 0 Mana cost: USD: $7.20 EUR: 1.00 TIX: 0.00 EDHREC RANK: - Each noncreature artifact you control is an artifact creature with power and toughness each equal to its mana value